TLKs 90 Interesting Northern Hemisphere Variable Stars.xlsx

	A	B	C	D	E	F	G	H	I	J	K	L	M	N	O
1	STAR	CONST.	SAO #	RA (2000)			DEC (2000)				VAR. TYPE	Mag Max	Mag Min	PERIOD (Days)	DESCRIPTION

2	SU And	Andromeda		0	4	36.4	+	43	33	5	LC	8	8.5		Red Carbon Star
3	VX And	Andromeda		0	19	54	+	44	42	34	SRA	7.8	9.3	369	Red Carbon Star
4	Z And The Original Symbiotic Variable	Andromeda		23	33	40	+	48	49	6	ZAND	8	12.4		Symbiotic Variable, a binary where the secondary is pulling material from the outer envelope of the primary.
5	R And	Andromeda	53860	0	24	1.9	+	38	34	37	M	5.8	14.9	409.33	Pulsating Mira-type red giant
6	AQ And	Andromeda		0	27	31.7	+	35	35	15	SR	9.9	11.8	346
7	RY Aqr	Aquarius		21	20	16	-	10	48	8	EA/SD:	8.8	10.1	1.966594	Eclipsing binary
8	R Aqr	Aquarius	165849	23	43	49.5	-	15	17	4	M	5.8	12.4	386.96	Pulsating (Mira-type) red giant. A spectroscopic binary - companion is a variable subdwarf. Thus the system as a whole has irregular variability.
9	V Aql	Aquila	142985	19	4	24.2	-	5	41	5	SRB	6.6	8.4	353	Red Carbon Star
10	R Aql	Aquila	124266	19	6	22.3	+	8	13	48	M	5.5	12	284.2	Mira-type pulsating red giant. The variability is a bit of an optical illusion - its light output is shifting from visible to infrared as it cools; the actual energy output is only dropping one magnitude. At minimum its temperature has dropped from 2350°K to 1890°K; one of the coolest stars known.
11	Eta Aql	Aquila	125159	19	52	28.4	+	1	0	20	DCEP	3.48	4.39	7.176641	One of the brightest Cepheid variables.
12	Epsilon Aur	Auriga	39955	5	1	58.1	+	43	49	24	EA/GS	2.92	3.83	9892	White supergiant eclipsing binary. Every 27 years the companion eclipses the primary for about a year, dropping the magnitude to 3.8; the next eclipse is due in 2009. The companion has never been seen, and seems to be a star surrounded by a shell of obscuring dust.
13	Zeta Aur	Auriga	39966	5	2	28.7	+	41	4	33	EA/GS	3.7	3.97	972.16	Orange giant eclipsing binary.
14	TX Aur	Auriga		5	9	5.5	+	39	0	8	LB	8.5	9.2		Red Carbon Star; near SAO 57755.
15	UV Aur	Auriga		5	21	48.9	+	32	30	43	M	7.4	10.6	394.42	Red Carbon Star
16	UU Aur	Auriga		6	36	32.8	+	38	26	44	SRB	7.83	10	234	Red Carbon Star
17	U Cam	Camelopardalis		3	41	48.2	+	62	38	54	SRB	11	12.8
18	ST Cam	Camelopardalis		4	51	13.3	+	68	10	8	SRB	9.2	12	300	Red Carbon Star
19	X Cnc	Cancer	98230	8	55	22.9	+	17	13	53	SRB	5.6	7.5	195
20	Y CVn La Superba	Canes Venatici	44317	12	45	7.8	+	45	26	25	SRB	7.4	10	157	Red Carbon Star. Named "La Superba" by the 19th century astronomer Pietro Secchi. An enormous star whose diameter is 1 billion miles (outside the orbit of Saturn)!
21	W CMa	Canis Major	152427	7	8	3.4	-	11	55	24	LB	6.35	7.9		Red Carbon Star
22	RT Cap	Capricornus		20	17	6.5	-	21	19	4	SRB	8.9	11.7	393	Red Carbon Star
23	ST Cas	Cassiopeia		0	17	32.1	+	50	17	14	SR	11.6	12.4		Red Carbon Star, actually mag 9 at maximum.
24	RZ Cas	Cassiopeia	12445	2	48	55.5	+	69	38	3	EA/SD	6.18	7.72	1.195247	Eclipsing binary: varies from mag 6.2 to 7.7 in a single 4-hour period every 1.19 days - variation should be visible in one evening.
25	R Cas	Cassiopeia	35938	23	58	24.9	+	51	23	20	M	4.7	13.5	430.46	Long-period Mira-type variable (pulsating cool red giant). Variability occurs as its light output shifts to infrared.
26	T Cen	Centaurus	204739	13	41	45.6	-	33	35	51	SRA	5.5	9	90.44
27	U Cep	Cepheus		1	2	18.4	+	81	52	32	EA/SD	6.75	9.24	2.4930475	Eclipsing binary.
28	T Cep	Cepheus	19229	21	9	31.8	+	68	29	27	M	5.2	11.3	388.14	Red giant Mira-type variable.
29	S Cep	Cepheus	10100	21	35	12.8	+	78	37	28	M	7.4	12.9	486.84	One of the reddest stars in the sky. Mira-type pulsating red giant; first observed by Lelande in 1789.
30	V V Cep	Cepheus	19753	21	56	39.1	+	63	37	32	EA/GS+SRC	4.8	5.36	7430	A semi-regular variable red supergiant. Also an eclipsing binary, being eclipsed by a smaller blue companion - this period is 20 years but the magnitude variation due to the eclipse is slight. The primary may be the largest star in the sky, with a diameter of 1621 times the Sun, which is outside the orbit of Saturn!
31	MU Cep Herschel's Garnet Star	Cepheus	33693	22	23	38.6	+	57	40	51	CEP	12.7	14.1	3.76782	Supergiant star and one of the reddest naked-eye stars in the sky; Mars' North Star. Irregular variable; perhaps a billion miles in diameter; thus its outer atmosphere is cool enough to contain water vapor as steam!
32	Delta Cep The Original Cepheid Variable	Cepheus	34508	22	29	10.3	+	58	24	55	DCEP	3.48	4.37	5.366341	Yellow supergiant and the original of the Cepheid (pulsating) Variables, which have a variable period related to their luminosity so their magnitudes were used to determine interstellar distances in the 1920s.
33	Omi Cet MIRA	Cetus	129825	2	19	20.8	-	2	58	40	M	2	10.1	331.96	Mira - the first variable star discovered, by David Fabricius in 1596. A red giant which at maximum is one of the largest stars in the sky (500X the size of the Sun).
34	UV Cet Luyten's Flare Star	Cetus		1	39	1.4	-	17	57	2	UV	6.8	12.95		A binary of magnitude 12.5 and 13 red dwarf stars. With a combined mass of 0.08 times the sun, they are among the least massive stars yet identified. With their low luminosity (0.00007 x the sun), the only reason they can be seen at all is because they are only 9 ly away, the sixth closest star. However, B is "Luyten's Flare Star", discovered by W. J. Luyten at the University of Minnesota in 1949; it flares up to magnitude 6 occasionally. The flare only lasts a few minutes and is a solar flare similar to the sun's, but is much more dramatic because of the star's low intrinsic luminosity.
35	R CrB	Corona Borealis	84015	15	48	34.4	+	28	9	24	RCB	5.71	14.8		Yellow supergiant 7,000 ly away. Irregular variable, discovered in 1795. Every few years it fades with no predictable pattern, to at least mag 7 and as low as mag 15, for a few weeks.
36	T CrB Blaze Star	Corona Borealis		15	59	30.2	+	25	55	13	NR	2	10.8	29000	One of the few recurrent novae known. Normally mag 10 but flared up to mag 2 in 1866 and 1946. A very close binary consisting of a white dwarf and red giant.
37	R Cyg	Cygnus	31822	19	36	49.4	+	50	11	59	M	6.1	14.4	426.45	Long-period Mira-type variable (pulsating cool red giant).
38	TT Cyg	Cygnus		19	40	57	+	32	37	6	SRB	10.2	11.9	118	Red Carbon Star
39	Chi Cyg	Cygnus	68943	19	50	33.9	+	32	54	51	M	3.3	14.2	408.05	One of the first stars to be identified as a variable, by Gottfried Kirch in 1686.
40	RY Cyg	Cygnus		20	10	23.4	+	35	56	49	LB	8.5	10.3		Red Carbon Star
41	P Cyg	Cygnus	69773	20	17	47.2	+	38	1	59	SDOR	3	6		Blue supergiant evolving into a red supergiant. Erratic variable; varies from mag 3 to mag 6, but it has been gradually brightening since the 18th century.
42	U Cyg	Cygnus		20	19	36.6	+	47	53	39	M	5.9	12.1	463.24	Red Carbon Star
43	V460 Cyg	Cygnus	71613	21	42	1.1	+	35	30	37	SRB	5.57	7	180	An unresolved binary believed to harbor a Black Hole.
44	SS Cyg	Cygnus		21	42	42.8	+	43	35	10	UGSS	7.7	12.4	49.5	An unusual "cataclysmic" variable that is a binary pair of dwarf stars. The system is normally at mag 11 - 12, but approximately every 25 days it flares up 4 magnitudes for a few days, then returns to its former magnitude.
45	RY Dra	Draco	15945	12	56	25.9	+	65	59	40	SRB:	6.03	8	200	Variable red giant
46	R Dra	Draco	17137	16	32	40.2	+	66	45	18	M	6.7	13.2	245.6	Long-period Mira-type variable (pulsating cool red giant).
47	UX Dra	Draco	9404	19	21	35.5	+	76	33	35	SRA:	5.94	7.1	168	Red Carbon Star
48	Eta Gem	Gemini	78135	6	14	52.7	+	22	30	24	SRA+EA	3.15	3.9	232.9	A red giant semi-regular variable. Also a binary - the secondary is mag 8.8 with a separation of only 1.4".
49	Zeta Gem	Gemini	79031	7	4	6.5	+	20	34	13	DCEP	3.62	4.18	10.15073	One of the brightest Cepheid variables.
50	U Gem	Gemini		7	55	5.2	+	22	0	5	UGSS+E	8.2	14.9	105.2	An extremely close (a few hundred thousand miles, center-to-center) binary system and a cataclysmic variable: normally at mag 14 but brightens to mag 9 unpredictably, in a period varying from 62 to 257 days.
51	Alpha Her Ras Algethi	Hercules	102680	17	14	38.9	+	14	23	25	SRC	2.74	4		The primary is a semiregular (average period of 90 days) pulsating red supergiant and one of the largest naked-eye stars known, at 400X to 600X the sun's diameter. It has a companion - a close (blue) binary, mag 5.4, with a separation of 4.8" and an orbital period of 3,600 years. The primary is surrounded by an expanding shell of very tenuous gas, which engulfs the companion.
52	Y Hya	Hydra	178088	9	51	3.7	-	23	1	2	SRB	8.3	12	302.8	Red Carbon Star
53	U Hya	Hydra	156110	10	37	33.3	-	13	23	4	SRB	7	9.4	450	Red Carbon Star
54	R Hya	Hydra	181695	13	29	42.8	-	23	16	53	M	3.5	10.9	388.87	Mira-type pulsating red giant (the red color is most visible at minimum). The fourth variable star to be discovered, by the Italian astronomer Maraldo in 1704. Its period has been shortening.
55	R Leo Peltier's Variable Star	Leo	98769	9	47	33.5	+	11	25	44	M	4.4	11.3	309.95	The variable that started Leslie Peltier on his career in 1918. Mira-type pulsating red giant. At maximum one of the largest stars in the sky, with a diameter of Jupiter's orbit. Because of its size and proximity (600 ly) the Hubble actually was able to image this star, and shows it to have an oval shape!
56	R Lep Hind's Crimson Star	Lepus	150058	4	59	36.3	-	14	48	23	M	5.5	11.7	427.07	Discovered by John Hind of London in 1845. Mira-type pulsating red giant.
57	Sigma Lib	Libra	183139	15	4	4.2	-	25	16	55	SRB	3.2	3.46	20	Irregular variable.
58	T Lyr	Lyra		18	32	20.1	+	36	59	56	LB	7.84	9.6		Red Carbon Star
59	HK Lyr	Lyra		18	42	50	+	36	57	31	LB	7.8	9.6		Red Carbon Star
60	Beta Lyr	Lyra	67451	18	50	4.8	+	33	21	46	EB	3.25	4.36	12.913834	Quadruple-star system; the primary is an eclipsing binary of two giant suns almost touching each other (and consequently having ovoid shapes).
61	RR Lyr Prototype Cluster Variable	Lyra	48421	19	25	27.9	+	42	47	4	RRAB	7.06	8.12	0.56686776	Prototype "cluster variable" star, because large numbers of them are found in many globular clusters, and their identical luminosities helps in determining the distance to these GCs. Much of RR Lyrae's variability can be seen in one night.
62	V Oph	Ophiuchus	159916	16	26	43.7	-	12	25	36	M	7.3	11.6	297.21	Red Carbon Star
63	X Oph	Ophiuchus	123744	18	38	21.1	+	8	50	3	M	5.9	9.2	328.85	Mira-type pulsating red giant.
64	W Ori	Orion	112406	5	5	23.7	+	1	10	39	SRB	8.2	12.4	212	Red Carbon Star
65	U Ori	Orion		5	55	49.2	+	20	10	31	M	4.8	13	368.3	Mira-type pulsating red giant.
66	BL Ori	Orion	95659	6	25	28.2	+	14	43	19	LB	7.9	9.7		Red Carbon Star
67	FU Ori	Orion		5	45	22.4	+	9	4	11	FU	9.6	16.5		Increased from mag 16 to mag 9 in 1937, and has remained there. A yellow supergiant that at the time was assumed to be a nova but now is thought to be a star that exhibited early stages of development. Nine other "FUor" variables have since been discovered.
68	AG Peg	Pegasus	107436	21	51	2	+	12	37	32	NC	6	9.4		Symbiotic Variable" (Z-Andromeda type variable), a binary where the secondary - in this case a compact blue subdwarf - is pulling material from the outer envelope of the red giant primary.
69	Rho Per	Perseus	56138	3	5	10.6	+	38	50	25	SRB	3.3	4	50
70	Beta Per Algol Prototypical Eclipsing Binary	Perseus	38592	3	8	10.1	+	40	57	20	EA/SD	2.12	3.39	2.8673043	"The Demon Star" [from Arabic - the Demon's Head - the head of Medusa being held up by Perseus]. It is an eclipsing binary, eclipsing for 10 hours about every 3 days. The 5-hour magnitude drop can often be viewed during a night of observing. The two stars are only 6 million miles apart, center-to-center.
71	Y Per	Perseus		3	27	42.4	+	44	10	36	M	8.1	11.3	248.6	Red Carbon Star
72	UU Psc	Pisces	109087	0	14	58.8	+	8	49	15	ELL/DW:	6.01	6.05	0.841678	Algol-type eclipsing binary
73	Z Psc	Pisces	74593	1	16	5	+	25	46	10	SRB	8.8	10.1	144	Red Carbon Star
74	TX Psc	Pisces		23	46	23.5	+	3	29	13	LB	4.79	5.2		Red Carbon Star; semi-regular variable.
75	PV Pup	Puppis	153363	7	45	28.7	-	14	41	9	EA/DM	6.88	7.32	1.660728	The secondary of this binary star is itself an eclipsing binary and thus gives the system a slight variablility (mag 6.9 to 7.3 with a period of 40 hours).
76	U Sge	Sagitta	104711	19	18	48.5	+	19	36	37	EA/SD	6.45	9.28	3.38061933	Eclipsing binary; drops from mag 6.4 to 9, for 1 hr 40 min every 3 days 9 hours.
77	X Sge	Sagitta		20	5	5.3	+	20	38	54	SR	7	9.7	196	Red semi-variable.
78	WZ Sge	Sagitta		20	7	36.7	+	17	42	15	UGSU+E+ZZ	7	15.53	11900	"Cataclysmic Variable" (dwarf nova); normally at magnitude 15.5, but every ~30 years it flares up dramatically. The last outburst was in 2001, when it reached magnitude 8.2. Believed to be a binary with an orbital period of about 80 minutes!
79	FG Sge	Sagitta		20	11	56	+	20	20	7	*	9.45	13.6		A variable star (mag 13.7 to 9.1, then back to 15) within planetary nebula He 1-5; it has evolved into an orange supergiant within the last 100 years. Stellar evolution events that occur within the span of a human lifetime are exceptionally rare.
80	V1492 Sgr	Sagittarius	162465	18	4	15.2	-	29	52	18	E	15.2	15.9	0.51	Irregular variable.
81	RU Sgr	Sagittarius	229959	19	58	42.9	-	41	50	58	M	6	13.8	240.49
82	RT Sgr	Sagittarius		20	17	43.9	-	39	6	45	M	6	14.1	306.46	Long-period Mira-type variable (pulsating cool red giant).
83	Delta Sco	Scorpius	184014	16	0	20	-	22	37	18	GCAS	1.86	2.32		In July, 2000, Delta brightened and has since fluctuated to as high as mag 1.6
84	R Scl	Sculptor	193122	1	26	58.1	-	32	32	34	SRB	9.1	12.9	370	Red Carbon Star
85	R Sct	Scutum	142620	18	47	29.1	-	5	42	17	RVA	4.2	8.6	146.5	A pulsating yellow supergiant of the class RV Tauri stars; discovered in 1797. Varies between magnitude 5 and 6, but every 4th or 5th cycle it drops to magnitude 8.
86	S Sct	Scutum	142674	18	50	20	-	7	54	27	SRB	9.63	10.9	148	Red Carbon Star
87	R Ser	Serpens	101771	15	50	41.7	+	15	8	3	M	5.16	14.4	356.41	Mira-type pulsating red giant.
88	T Tau	Taurus		4	21	59.2	+	19	32	7	INT	9.3	13.5		Within NGC 1555 (Hind's Variable Nebula). T Tauri's brightness and spectrum change erratically, thought to be caused by the conflict between the last stages of gravitational contraction and the first stages of hydrogen fusion in its core.
89	RV Tau	Taurus		4	47	6.8	+	26	10	44	RVB	9.8	13.3	78.731	A pulsating yellow supergiant; prototype of this class of variables.
90	Y Tau	Taurus		5	45	39.4	+	20	41	42	SRB	6.5	9.2	241.5	Red Carbon Star
91	R Tri	Triangulum	55687	2	37	2.2	+	34	15	54	M	5.4	12.6	266.9	Long-period Mira-type variable (pulsating cool red giant).
92	R UMa	Ursa Major	15273	10	44	38.8	+	68	46	33	M	6.5	13.7	301.62	Long-period Mira-type variable (pulsating cool red giant).
93	VY UMa	Ursa Major	15274	10	45	3.9	+	67	24	41	LB	5.87	7		Red Carbon Star
94	SS Vir	Virgo		12	25	13.7	+	0	46	12	SRA	6	9.6	364.14	Red Carbon Star
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