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 372 light years,[1] but is drifting away at a rate of 17 km/s.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 03h 49m 13.7393s[1] |
| Declination | +70° 52′ 15.781″[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: 21.451(45) mas/yr[1] Dec.: −62.431(55) mas/yr[1] |
| Parallax (π) | 8.7759 ± 0.0632 mas[1] |
| Distance | 372 ± 3 ly (113.9 ± 0.8 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 periastron (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 |
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
edit- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b 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.
- ^ a b 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. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049.
- ^ a b 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.
- ^ 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 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. Bibcode:1980BICDS..19...71K. ISSN 1169-8837.
- ^ a b c d e f 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361.
- ^ a b 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. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433. ISSN 0035-8711.
- ^ a b c 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. Bibcode:2009MNRAS.392..448H. doi:10.1111/j.1365-2966.2008.14073.x. ISSN 0035-8711.
- ^ "Digital Demo Room - Stellar Structure and Evolution Simulator". rainman.astro.illinois.edu. Retrieved 30 December 2021.
- ^ Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; Levato, H.; Morrell, N. I.; Torres, G.; Udry, S. (September 2004). "SB9: The ninth catalogue of spectroscopic binary orbits". Astronomy and Astrophysics. 424: 727–732. arXiv:astro-ph/0406573. Bibcode:2004A&A...424..727P. doi:10.1051/0004-6361:20041213. ISSN 0004-6361.