Astronomy:HD 197036
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Short description: Star in the constellation Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas/yr Dec.: −1.586[1] mas/yr |
| Parallax (π) | 2.4923 ± 0.0284[1] mas |
| 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
- ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ Rountree Lesh, Janet (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". The Astrophysical Journal Supplement Series 17: 371. doi:10.1086/190179. ISSN 0067-0049. Bibcode: 1968ApJS...17..371L.
- ↑ Reed, B. Cameron (May 2003). "Catalog of Galactic OB Stars". The Astronomical Journal 125 (5): 2531–2533. doi:10.1086/374771. ISSN 0004-6256. Bibcode: 2003AJ....125.2531R.
- ↑ 5.0 5.1 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities.". Carnegie Institute Washington D.C. Publication: 0. Bibcode: 1953GCRV..C......0W.
- ↑ 6.0 6.1 6.2 6.3 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 7.2 7.3 7.4 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. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ 8.0 8.1 Lang, Kenneth R. (2006). Astrophysical formulae. Astronomy and astrophysics library. 1 (3 ed.). Birkhäuser. ISBN 3-540-29692-1. https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41.. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 2\cdot R_* & = \frac{(401\cdot 0.12\cdot 10^{-3})\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\ & \approx 10.35\cdot R_{\bigodot} \end{align} }[/math]
- ↑ 9.0 9.1 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.
- ↑ 10.0 10.1 Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal 573 (1): 359–365. doi:10.1086/340590. ISSN 0004-637X. Bibcode: 2002ApJ...573..359A.
- ↑ 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.
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