HD 197036
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h 39m 23.1274s[1] |
| Declination | +45° 40′ 00.9405″[1] |
| Apparent magnitude (V) | 6.61±0.01[2] |
| Characteristics | |
| Spectral type | B5 IV[3] |
| U−B color index | -0.59[4][2] |
| B−V color index | −0.07[2] |
| Astrometry | |
| Radial velocity (Rv) | −15±2[5] km/s |
| Proper motion (μ) | RA: +3.737 mas/yr[1] Dec.: −1.586 mas/yr[1] |
| Parallax (π) | 2.4923 ± 0.0284 mas[1] |
| Distance | 1,310 ± 10 ly (401 ± 5 pc) |
| Absolute magnitude (MV) | −1.15[6] |
| Details | |
| Mass | 4.21[7] M☉ |
| Radius | 5.17[8] R☉ |
| Luminosity | 379[6] L☉ |
| Surface gravity (log g) | 3.52[7] cgs |
| Temperature | 13,399[9] K |
| Metallicity [Fe/H] | −0.03[7] dex |
| Rotational velocity (v sin i) | 135[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 197036 is a single star in the northern constellation Cygnus. It has an absolute magnitude of −1.15[6] and an apparent magnitude of 6.61,[2] below the max naked eye visibility. Located 1,310 light years away, it is approaching Earth with a heliocentric radial velocity of −15 km/s.[5]
HD 197036 is a bluish white subgiant star of the spectral type B5IV, and has an angular diameter of 0.12 mas.[11] This yields a radius of 5.17 R☉[8] at its estimated distance. At present it has 4.21 times the mass of the Sun[7] and shines at 379 times the luminosity of the Sun[6] from its photosphere at an effective temperature of 13,399 K,[9] giving it a bluish white hue. Like many hot stars, it spins rapidly with a projected rotational velocity of 135 km/s−1[10] and has a near solar metallicity.[7]
References
[edit]- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c d Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ Rountree Lesh, Janet (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". The Astrophysical Journal Supplement Series. 17: 371. Bibcode:1968ApJS...17..371L. doi:10.1086/190179. ISSN 0067-0049.
- ^ Reed, B. Cameron (May 2003). "Catalog of Galactic OB Stars". The Astronomical Journal. 125 (5): 2531–2533. Bibcode:2003AJ....125.2531R. doi:10.1086/374771. ISSN 0004-6256.
- ^ a b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
- ^ a b c d Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
- ^ a b c d e Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361.
- ^ a b Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. Vol. 1 (3 ed.). Birkhäuser. ISBN 3-540-29692-1.. The radius (R*) is given by:
- ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ a b Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590. ISSN 0004-637X.
- ^ Bourgés, L.; Lafrasse, S.; Mella, G.; Chesneau, O.; Bouquin, J. L.; Duvert, G.; Chelli, A.; Delfosse, X. (May 2014). "The JMMC Stellar Diameters Catalog v2 (JSDC): A New Release Based on SearchCal Improvements". Astronomical Data Analysis Software and Systems Xxiii. 485: 223. Bibcode:2014ASPC..485..223B.