Astronomy:HR 515

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Short description: Star in the constellation Pisces
HR 515
VYPscLightCurve.png
Light curves for VY Piscium, adapted from Valtier et al. (1974).[1] The vertical scale is hundredths of a magnitude.
Observation data
Equinox J2000.0]] (ICRS)
Constellation Pisces
Right ascension  01h 46m 35.29855s[2]
Declination +17° 24′ 45.7125″[2]
Apparent magnitude (V) 6.54 - 6.59[3]
Characteristics
Spectral type A8 III[4] or F0V[5]
B−V color index 0.256±0.010[6]
Variable type δ Sct[7]
Astrometry
Radial velocity (Rv)−1.0±4.4[8] km/s
Proper motion (μ) RA: +49.315[2] mas/yr
Dec.: +3.096[2] mas/yr
Parallax (π)6.4827 ± 0.1220[2] mas
Distance503 ± 9 ly
(154 ± 3 pc)
Absolute magnitude (MV)+0.84[6]
Details
Mass1.7[9] M☉
Radius4.7[9] R☉
Luminosity60[9] L☉
Surface gravity (log g)3.32[9] cgs
Temperature7,401[9] K
Metallicity [Fe/H]−0.02[10] dex
Rotational velocity (v sin i)96[11] km/s
Age944[10] Myr
Other designations
3 Arietis, VY Psc, BD+16°196, HD 10845, HIP 8271, HR 515, SAO 92622[12]
Database references
SIMBADdata

HR 515 is a variable star in the zodiac constellation of Pisces, near the eastern constellation border with Aries. Before the constellation borders were officially set, it held the Flamsteed designation of 3 Arietis, abbreviated 3 Ari). This star has the variable star designation VY Piscium, or VY Psc for short.[13] It is a white-hued star that is near the lower limit of visibility to the naked eye with an apparent visual magnitude that ranges from 6.54 down to 6.59.[3] Parallax measurements provide a distance estimate of approximately 503 light years from the Sun.[2]

Gray and associates (1989) found a stellar classification of A8 III[4] for this object, matching an evolved A-type giant star. Abt and Morrell (1995) listed a class of F0V,[5] suggesting it is an F-type main-sequence star. It is a Delta Scuti variable whose brightness varies between magnitudes 6.54 and 6.59[3] with a period of 0.219 days.[7] The star shows a high rate of spin with a projected rotational velocity of 96 km/s.[11] It has 4.7 times the girth of the Sun and is radiating 60 times the Sun's luminosity from its photosphere at an effective temperature of 7,401 K.[9]

References

  1. ↑ Valtier, J. C.; Sareyan, J. P.; Le Contel, J. M.; Zribi, G. (January 1974). "Photometric observations of delta Scuti stars. II. HR 432, HR 515, HR 812". Astronomy and Astrophysics Supplement Series 18: 235–249. Bibcode: 1974A&AS...18..235V. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 "VY Psc". VSX: The International Variable Star Index. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=26439. 
  4. ↑ 4.0 4.1 Gray, R. O.; Garrison, R. F. (July 1989). "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". Astrophysical Journal Supplement 70: 623. doi:10.1086/191349. Bibcode: 1989ApJS...70..623G. 
  5. ↑ 5.0 5.1 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement 99: 135. doi:10.1086/192182. Bibcode: 1995ApJS...99..135A. 
  6. ↑ 6.0 6.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 Rodríguez, E.; López-González, M. J.; López de Coca, P. (June 2000). "A revised catalogue of delta Sct stars". Astronomy and Astrophysics Supplement 144 (3): 469−474. doi:10.1051/aas:2000221. Bibcode: 2000A&AS..144..469R. 
  8. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012). "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project". Astronomy & Astrophysics 546: 14. doi:10.1051/0004-6361/201219219. A61. Bibcode: 2012A&A...546A..61D. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 1063-7737. Bibcode: 2012AstL...38..771G. 
  11. ↑ 11.0 11.1 Royer, F. et al. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics 393: 897–911. doi:10.1051/0004-6361:20020943. Bibcode: 2002A&A...393..897R. 
  12. ↑ "V* VY Psc". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+VY+Psc. 
  13. ↑ "VY Psc (VY Piscium)". VSNET. http://www.kusastro.kyoto-u.ac.jp/vsnet/gcvs2/PSCVY.html. 

Coordinates: Sky map 01h 46m 35.29944s, +17° 24′ 45.7133″



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