Astronomy:Tau7 Serpentis
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Short description: Star in the constellation Serpens
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Serpens[1] |
| Right ascension | 15h 41m 54.7166s[2] |
| Declination | +18° 27′ 50.531″[2] |
| Apparent magnitude (V) | 5.8[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A8Vam[4] |
| U−B color index | +0.11[5] |
| B−V color index | +0.20[5] |
| R−I color index | +0.10[5] |
| Astrometry | |
| Radial velocity (Rv) | −31.38±0.12[2] km/s |
| Proper motion (μ) | RA: −61.654[2] mas/yr Dec.: +54.319[2] mas/yr |
| Parallax (π) | 18.7185 ± 0.0408[2] mas |
| Distance | 174.2 ± 0.4 ly (53.4 ± 0.1 pc) |
| Absolute magnitude (MV) | +2.18[1] |
| Details | |
| Mass | 1.8[6] M☉ |
| Radius | 1.8[6] R☉ |
| Luminosity | 11[6] L☉ |
| Surface gravity (log g) | 4.20[6] cgs |
| Temperature | 7,809[6] K |
| Metallicity [Fe/H] | −0.02[7] dex |
| Rotational velocity (v sin i) | 78[8] km/s |
| Age | 839[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Tau7 Serpentis, Latinized from τ7 Serpentis, is an A-type star in the constellation of Serpens, 174 light-years from the Earth. It has an apparent visual magnitude of approximately 5.804. It is a well-known Am star, a type of chemically peculiar star with unusually strong lines of heavier elements (metals) due to slow rotation and stratification of elements in the star's atmosphere.[10]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 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.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355. Bibcode: 2000A&A...355L..27H.
- ↑ Barry, Don C. (1970). "Spectral Classification of a and F Stars". Astrophysical Journal Supplement 19: 281. doi:10.1086/190209. Bibcode: 1970ApJS...19..281B.
- ↑ 5.0 5.1 5.2 HR 5845, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 19, 2008.
- ↑ 6.0 6.1 6.2 6.3 6.4 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S.
- ↑ 7.0 7.1 Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G.
- ↑ Schröder, C.; Schmitt, J. H. M. M. (2007). "X-ray emission from A-type stars". Astronomy and Astrophysics 475 (2): 677. doi:10.1051/0004-6361:20077429. Bibcode: 2007A&A...475..677S.
- ↑ * 22 Ser -- Star, database entry, SIMBAD. Accessed on line September 19, 2008.
- ↑ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics 498 (3): 961. doi:10.1051/0004-6361/200810788. Bibcode: 2009A&A...498..961R.
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