HR 515
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.[10] 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.[2] Parallax measurements provide a distance estimate of approximately 570 light years from the Sun.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 01h 46m 35.29895s[1] |
| Declination | +17° 24′ 45.7172″[1] |
| Apparent magnitude (V) | 6.54 - 6.59[2] |
| Characteristics | |
| Spectral type | A8 III[3] or F0V[4] |
| B−V color index | 0.256±0.010[5] |
| Variable type | δ Sct[6] |
| Astrometry | |
| Radial velocity (Rv) | −1.0±4.4[7] km/s |
| Proper motion (μ) | RA: +48.949[1] mas/yr Dec.: + 2.819[1] mas/yr |
| Parallax (π) | 5.7074 ± 0.1492[1] mas |
| Distance | 570 ± 10 ly (175 ± 5 pc) |
| Absolute magnitude (MV) | 0.84[5] |
| Details | |
| Radius | 4.82+0.17 −0.22[1] R☉ |
| Luminosity | 57.8±1.7[1] L☉ |
| Temperature | 7,253+168 −128[1] K |
| Rotational velocity (v sin i) | 96[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Gray and associates (1989) found a stellar classification of A8 III[3] for this object, matching an evolved A-type giant star. Abt and Morrell (1995) listed a class of F0V,[4] 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[2] with a period of 0.219 days.[6] The star shows a high rate of spin with a projected rotational velocity of 96 km/s.[8] It has 4.8 times the girth of the Sun and is radiating 58 times the Sun's luminosity from its photosphere at an effective temperature of 7,253 K.[1]
References
- 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.
- "VY Psc". VSX: The International Variable Star Index. American Association of Variable Star Observers. Retrieved 1 August 2014.
- 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. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
- Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
- Rodríguez, E.; López-González, M. J.; López de Coca, P. (June 2000). "A revised catalogue of delta Sct stars". Astronomy and Astrophysics Supplement. 144: 469−474. Bibcode:2000A&AS..144..469R. doi:10.1051/aas:2000221.
- 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. arXiv:1208.3048. Bibcode:2012A&A...546A..61D. doi:10.1051/0004-6361/201219219. A61.
- 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. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943.
- "V* VY Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-02-26.
- "VY Psc (VY Piscium)". VSNET. Retrieved 1 August 2014.