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S Vulpeculae

A visual band light curve for S Vulpeculae, adapted from Heiser (1996)
Observation data Epoch J2000      Equinox J2000
Constellation	Vulpecula
Right ascension	19 48 23.8064
Declination	27° 17′ 11.4265″
Apparent magnitude (V)	8.974 (8.69 - 9.42)
Characteristics
Spectral type	G0-K2(M1)
U−B color index	+1.3 - +2.0
B−V color index	+1.7 - +2.1
Variable type	δ Cep
Astrometry
Radial velocity (Rv)	0.0 ± 2 km/s
Proper motion (μ)	RA: −3.401±0.058 mas/yr Dec.: −5.923±0.059 mas/yr
Parallax (π)	0.3050 ± 0.0406 mas
Distance	approx. 11,000 ly (approx. 3,300 pc)
Absolute magnitude (MV)	−6.08
Details
Mass	14.2 M☉
Radius	382 R☉
Luminosity	28,840 L☉
Temperature	4,477 K
Metallicity	−0.01 dex
Age	12.6 Myr
Other designations
S Vulpeculae, SAO 87743, HD 338867, BD+26°3674, AAVSO 1944+27
Database references
SIMBAD	data

S Vulpeculae is a variable star located in the constellation Vulpecula. A supergiant star, it is around 382 times the diameter of the Sun.

S Vulpeculae was first suspected of varying in brightness in 1836 and this was confirmed by 1862. A pulsating variable that grows and shrinks as it changes in brightness, it has been variously classified as an RV Tauri variable, a semiregular variable star, or a Cepheid variable.

S Vulpeculae is now confirmed as a classical Cepheid variable with one of the longest known periods at 68 days, although the period has changed several times. As such, it is also one of the cooler and more luminous of the Cepheids, and it lies close to the zone where semiregular variable stars are found. The shape and amplitude of the light curve varies significantly from cycle to cycle and secularly. The apparent magnitude ranges from 8.69 to 9.42. The spectrum varies from early G to late K as it pulsates, with TiO bands typical of an M1 star when the star is coolest.

References

1. ^ Heiser, Arnold M. (1996). "BV Observations of the Long-Period Cepheid S Vulpeculae". Publications of the Astronomical Society of the Pacific. 108: 603. Bibcode:1996PASP..108..603H. doi:10.1086/133771.
2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
3. ^ Turner, David G. (2014). "Towards a Determination of Definitive Parameters for the Long Period Cepheid S Vulpeculae". Odessa Astronomical Publications. 26: 115. arXiv:1403.1968. Bibcode:2013OAP....26..115T.
4. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
5. ^ Joy, Alfred H. (1952). "The Semiregular Variable Stars of the RV Tauri and Related Classes". Astrophysical Journal. 115: 25. Bibcode:1952ApJ...115...25J. doi:10.1086/145506.
6. ^ Berdnikov, L. N.; Ivanov, G. R. (1986). "On the Type of Variability of S Vul". Information Bulletin on Variable Stars. 2856: 1. Bibcode:1986IBVS.2856....1B.
7. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
8. ^ Gieren, Wolfgang P.; Fouque, Pascal; Gomez, Matias (1998). "Cepheid Period‐Radius and Period‐Luminosity Relations and the Distance to the Large Magellanic Cloud". The Astrophysical Journal. 496 (1): 17–30. arXiv:astro-ph/9710161. Bibcode:1998ApJ...496...17G. doi:10.1086/305374. S2CID 14881794.
9. Marsakov, V. A.; Koval', V. V.; Kovtyukh, V. V.; Mishenina, T. V. (2013). "Properties of the population of classical Cepheids in the Galaxy". Astronomy Letters. 39 (12): 851. Bibcode:2013AstL...39..851M. doi:10.1134/S1063773713120050. S2CID 119788977.
10. Buscombe, W. (1974). "Supergiants in the Milky Way". Perem. Zvezdy. 2: 127. Bibcode:1974PZP.....2..127B.
11. Nassau, J. J.; Ashbrook, J. (1943). "S Vulpeculae". Astronomical Journal. 50: 97. Bibcode:1943AJ.....50...97N. doi:10.1086/105732.

v t e Constellation of Vulpecula
List of stars in Vulpecula Vulpecula in Chinese astronomy
Stars	Bayer α (Anser) Flamsteed 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 35 3 Cyg Variable R S T U V X Z RS SV VW WW AW BE BO BP BS BW DR ER LT LV MW NQ NR NS PS PU PW PX QQ QR QU QV QY V379 V387 V407 V452 V457 V458 HR 7207 7250 7263 7286 7364 7384 7391 7421 7452 7472 7490 7540 7556 7573 7601 7656 7716 7760 7811 7849 7862 7895 7903 8082 8158 8190 8194 8197 8198 HD 186943 187614 188015 189671 190066 190228 190322 201626 Other ASKAP J1935+2148 BD+23 3912 G 185-32 GD 385 GS 2000+25 HIP 100963 PSR B1919+21 PSR B1930+22 PSR B1937+21 PSR B1953+29 PSR B2020+28 PSR J1946+2052 PSR J2007+2722 Wolf 1346 WR 125 XTE J1859+226 SGR 1935+2154
Exoplanets HD 188015 b HD 189733 b
Star clusters Brocchi's Cluster NGC 6885 NGC 6940
Nebulae Dumbbell Nebula Hen 2-437 Sh2-88
Galaxies	NGC 7052 7080 Other 3C 433
Astronomical events AT 2021lwx
Category

• Vulpecula
• Classical Cepheid variables
• Objects with variable star designations
• K-type supergiants
• Henry Draper Catalogue objects
• Durchmusterung objects
• G-type supergiants