Astronomy:CD-73°375
From HandWiki
Short description: Binary star in the constellation Volans
  | |
| Observation data {{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| [[History:Epoch|Epoch J2000.0]] [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}} | |
|---|---|
| Constellation | Volans |
| A | |
| Right ascension | 07h 35m 21.656s[1] |
| Declination | −74° 16′ 29.83″[1] |
| Apparent magnitude (V) | 7.08[2] |
| B | |
| Right ascension | 07h 35m 22.036s[3] |
| Declination | −74° 16′ 30.96″[3] |
| Apparent magnitude (V) | 7.02[2] |
| Characteristics | |
| Evolutionary stage | subgiant |
| Spectral type | B9IV + B9IV[4] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +13.0[5] km/s |
| Proper motion (μ) | RA: −2.527±0.040[1] mas/yr Dec.: 21.791±0.033[1] mas/yr |
| Parallax (π) | 3.9430 ± 0.0292[1] mas |
| Distance | 827 ± 6 ly (254 ± 2 pc) |
| B | |
| Radial velocity (Rv) | +10.8[5] km/s |
| Proper motion (μ) | RA: −3.650±0.032 mas/yr Dec.: 18.164±0.034 mas/yr |
| Parallax (π) | 3.9907 ± 0.0274[3] mas |
| Distance | 817 ± 6 ly (251 ± 2 pc) |
| Details | |
| A | |
| Mass | 3.5[6] M☉ |
| Radius | 3.6[7] R☉ |
| Luminosity | 582[8] L☉ |
| Surface gravity (log g) | 3.96[6] cgs |
| Temperature | 13,005[6] K |
| Metallicity [Fe/H] | −0.15[6] dex |
| Rotational velocity (v sin i) | 17[8] km/s |
| B | |
| Mass | 3.4[6] M☉ |
| Surface gravity (log g) | 3.93[6] cgs |
| Temperature | 12,640[6] K |
| Metallicity [Fe/H] | −0.15[6] dex |
| Other designations | |
| A: {{{names2}}} | |
| B: {{{names3}}} | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
CD-73°375 is a binary star located in the constellation Volans about 820 light years away. The two components, HR 2979 and HR 2980, are separated by two arc-seconds. The pair has a combined apparent magnitude of 6.34. It has a radial velocity of about 13 km/s, which means it drifting away from the Solar System.
Properties
The two stars making up CD-73°375 are both B9 subgiants with almost identical properties. HR 2979 is generally designated as the primary because of its higher mass, although HR 2980 is marginally brighter at magnitude 7.02. They are 1.9″ apart and have an assumed orbit of 3,760 years.[9]
Each star has a mass about three and a half times the Sun's and a temperature of about 13,000 K.
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 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002-03-01). "The Tycho double star catalogue". Astronomy and Astrophysics 384: 180–189. doi:10.1051/0004-6361:20011822. ISSN 0004-6361. Bibcode: 2002A&A...384..180F.
- ↑ 3.0 3.1 3.2 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.
- ↑ Houk, Nancy (1975). "Michigan catalogue of two-dimensional spectral types for the HD stars". University of Michigan Catalogue of Two-Dimensional Spectral Types for the Hd Stars. Volume I. Declinations -90_ to -53_Ƒ0 (Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan) 1. Bibcode: 1975mcts.book.....H.
- ↑ 5.0 5.1 Andersen, J.; Nordstrom, B. (1983). "Radial velocities of bright southern stars. I - 139 B-type HR and FK stars". Astronomy and Astrophysics Supplement Series 52: 471–482. Bibcode: 1983A&AS...52..471A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A.
- ↑ Stassun, Keivan G.; Oelkers, Ryan J.; Pepper, Joshua; Paegert, Martin; De Lee, Nathan; Torres, Guillermo; Latham, David W.; Charpinet, Stéphane et al. (2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal 156 (3): 102. doi:10.3847/1538-3881/aad050. Bibcode: 2018AJ....156..102S.
- ↑ 8.0 8.1 Zorec, J.; Royer, F. (2012-01-01). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. Bibcode: 2012A&A...537A.120Z.
- ↑ Tokovinin, Andrei (2018-03-01). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series 235 (1): 6. doi:10.3847/1538-4365/aaa1a5. ISSN 0067-0049. Bibcode: 2018ApJS..235....6T.
 |  |
