Astronomy:HD 23277
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Short description: Star in the constellation of Camelopardalis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 03h 49m 13.7383s[1] |
| Declination | +70° 52′ 15.7862″[1] |
| Apparent magnitude (V) | 5.391 ± 0.009[2] |
| Characteristics | |
| Spectral type | kA2hA6VmA7[3] |
| U−B color index | +0.12[4] |
| B−V color index | +0.09[4] |
| Astrometry | |
| Radial velocity (Rv) | 17 ± 0.9[5] km/s |
| Proper motion (μ) | RA: +21.771[1] mas/yr Dec.: –62.787[1] mas/yr |
| Parallax (π) | 8.7803 ± 0.1100[1] mas |
| Distance | 371 ± 5 ly (114 ± 1 pc) |
| Absolute magnitude (MV) | +0.11 |
| Orbit[6] | |
| Primary | HD 23277 A |
| Companion | HD 23277 B |
| Period (P) | 15.5132 d |
| Semi-major axis (a) | 43.0229 AU |
| Eccentricity (e) | 0.2210 |
| Argument of periastron (ω) (secondary) | 287.41° |
| Argument of periapsis (ω) (primary) | 107.41° |
| Semi-amplitude (K1) (primary) | 22.20 km/s |
| Semi-amplitude (K2) (secondary) | 24.69 km/s |
| Details | |
| A | |
| Mass | 2.38 ± 0.13[7] M☉ |
| Radius | 3.55+0.16 −0.24[7] R☉ |
| Luminosity | 59.7[8] L☉ |
| Surface gravity (log g) | 3.72 ± 0.08[7] cgs |
| Temperature | 8,317+194 −189[7] K |
| Rotational velocity (v sin i) | 25 ± 5[9] km/s |
| Age | 610[10] Myr |
| B | |
| Mass | 2.11[6] M☉ |
| Rotational velocity (v sin i) | 25 ± 5[9] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 23277 (HR 1138) is a spectroscopic binary[11] located in the northern circumpolar constellation Camelopardalis. With a combined apparent magnitude of 5.39,[2] it is faintly visible to the naked eye under ideal conditions. This star is located at a distance of 371 light years,[1] but is drifting away at a rate of 17 km/s.[5]
The primary has a classification of kA2hA6VmA7,[3] which indicates that it has the calcium K-line of an A2 star, but its hydrogen lines suggest a class of A6 V and metallic lines of an A7 star. At present it has 2.38 times the Sun's mass, and 3.55 times its radius.[7] It radiates at 59.7 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 8,317 K,[7] which gives it a white hue. The companion has 2.11 times the Sun's mass,[6] which suggests it is an A-type main-sequence star like the primary. Both stars spin at a projected rotational velocity of 25 km/s, common for an Am star.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series 99: 135. doi:10.1086/192182. ISSN 0067-0049. Bibcode: 1995ApJS...99..135A.
- ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
- ↑ 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 Kraicheva, Z.; Popova, E.; Tutukov, A.; Yungelson, L. (July 1980). "Catalogue of physical parameters of spectroscopic binary stars.". Bulletin d'Information du Centre de Donnees Stellaires 19: 71. ISSN 1169-8837. Bibcode: 1980BICDS..19...71K.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode: 1999A&A...352..555A.
- ↑ 8.0 8.1 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (October 2017). "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.
- ↑ 9.0 9.1 9.2 Howe, K. S.; Clarke, C. J. (January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society 392 (1): 448–454. doi:10.1111/j.1365-2966.2008.14073.x. ISSN 0035-8711. Bibcode: 2009MNRAS.392..448H.
- ↑ "Digital Demo Room - Stellar Structure and Evolution Simulator". http://rainman.astro.illinois.edu/ddr/stellar/intermediate.html.
- ↑ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G. et al. (September 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics 424: 727–732. doi:10.1051/0004-6361:20041213. ISSN 0004-6361. Bibcode: 2004A&A...424..727P.
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