Astronomy:HR 4180
| Observation data {{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0 Equinox J2000.0 (ICRS)| Epoch J2000 [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}} | |
|---|---|
| Constellation | Vela[1] |
| HD 92449 | |
| Right ascension | 10h 39m 18.3925s[2] |
| Declination | −55° 36′ 11.765″[2] |
| Apparent magnitude (V) | 4.29[1] |
| HD 92463 | |
| Right ascension | 10h 39m 24.2778s[3] |
| Declination | −55° 36′ 25.642″[3] |
| Apparent magnitude (V) | 6.06[4] |
| Characteristics | |
| Spectral type | G5 IIa[5] + B8 V[6] |
| B−V color index | 1.025±0.003[1] |
| Astrometry | |
| HD 92449 | |
| Radial velocity (Rv) | +20.1±0.7[7] km/s |
| Proper motion (μ) | RA: −19.032(91)[2] mas/yr Dec.: 5.032(90)[2] mas/yr |
| Parallax (π) | 4.1595 ± 0.0940[2] mas |
| Distance | 780 ± 20 ly (240 ± 5 pc) |
| Absolute magnitude (MV) | −2.76[1] |
| HD 92463 | |
| Proper motion (μ) | RA: −18.941(40) mas/yr Dec.: 5.386(42) mas/yr |
| Parallax (π) | 4.2647 ± 0.0405[3] mas |
| Distance | 765 ± 7 ly (234 ± 2 pc) |
| Details | |
| A | |
| Mass | 3.43[8] M☉ |
| Radius | 48[9] R☉ |
| Luminosity | 1,340[9] L☉ |
| Surface gravity (log g) | 2.02[8] cgs |
| Temperature | 5,180[8] K |
| B | |
| Mass | 3.76[3] M☉ |
| Radius | 3.91[3] R☉ |
| Luminosity | 308[3] L☉ |
| Surface gravity (log g) | 3.736[3] cgs |
| Temperature | 12,240[3] K |
| Other designations | |
| A: CD−54 3915, HD 92449, HIP 52154, SAO 238309 | |
| B: CD−54 3675, HD 92463, SAO 238313 | |
| Database references | |
| SIMBAD | HD 92449 |
| HD 92463 | |
HR 4180 is a double star with components HD 92449 and HD 92463 in the southern constellation of Vela. They are probably members of a binary star system.[10] HR 4180 can be viewed with the naked eye, having an apparent visual magnitude of 4.29.[1] Based upon the annual parallax shift of the two stars it is located approximately 780 light years from the Sun.[2][3] The system is moving further from the Earth with a heliocentric radial velocity of +20 km/s.[7]
The primary component of this system, HD 92449, is a bright giant with a stellar classification of G5 IIa.[5] The star is estimated to have 3.4 times the mass of the Sun and 48 times the Sun's radius. It radiates 1,340 times the Sun's luminosity from its photosphere at an effective temperature of 5,180 K.[9][8]
The secondary is the common proper motion HD 92463,[11] of apparent magnitude 6.06.[4] The pair likely form a binary system.[10] This secondary component is a B-type main-sequence star with a class of B8 V,[6] and has an estimated 3.8 times the mass, 3.9 times the radius, and 308 times the Sun's luminosity.[3] As of 2000, it had an angular separation of 51.70″ along a position angle of 105° from the primary.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 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.
- ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 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.
- ↑ 4.0 4.1 4.2 Mason, B. D.; Wycoff, G. L. I.; Hartkopf, W. I. (2008). "Washington Visual Double Star Catalog, 2006.5 (WDS)". U. S. Naval Observatory, Washington D.C.. http://ad.usno.navy.mil/wds/.
- ↑ 5.0 5.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 6.0 6.1 Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 7.0 7.1 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. doi:10.1051/0004-6361/201219219. A61. Bibcode: 2012A&A...546A..61D.
- ↑ 8.0 8.1 8.2 8.3 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. 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.
- ↑ 9.0 9.1 9.2 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770–791. doi:10.1093/mnras/stx1433. ISSN 0035-8711. Bibcode: 2017MNRAS.471..770M. x Velorum's database entry at VizieR.
- ↑ 10.0 10.1 Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ Eggen, O. J. (June 15, 1980). "VY Carinae, S Normae, and photometric luminosities for bright giants and supergiants of types G and K". Astrophysical Journal, Part 1 238: 919–928. doi:10.1086/158055. Bibcode: 1980ApJ...238..919E.
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