HD 30453
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | 04h 49m 19.08028s[1] |
| Declination | 32° 35′ 17.4955″[1] |
| Apparent magnitude (V) | 5.86[2] |
| Characteristics | |
| Spectral type | A8m[3] or Am(A7/F0/F2)[4] |
| U−B color index | 0.14[2] |
| B−V color index | 0.24[2] |
| Astrometry | |
| Radial velocity (Rv) | 16.654±0.012[5] km/s |
| Proper motion (μ) | RA: 18.324[1] mas/yr Dec.: −34.866[1] mas/yr |
| Parallax (π) | 9.7628 ± 0.1172 mas[1] |
| Distance | 334 ± 4 ly (102 ± 1 pc) |
| Orbit[5] | |
| Period (P) | 7.0508687±0.0000023 d |
| Semi-major axis (a) | ≥5.7633±0.0016 Gm |
| Eccentricity (e) | 0.0 (adopted) |
| Periastron epoch (T) | 2454673.72440±0.00043 MJD |
| Semi-amplitude (K1) (primary) | 0.442±0.017 km/s |
| Semi-amplitude (K2) (secondary) | 0.283±0.065 km/s |
| Details | |
| Radius | 3.59 0.16 −0.45[1] R☉ |
| Luminosity | 38.2±0.5[1] L☉ |
| Temperature | 7,568 532 −160[1] K |
| Rotational velocity (v sin i) | 16.0±9.7[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 30453 is a binary star[8] system in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of 5.86.[2] The system is located at a distance of approximately 334 light years from the Sun based on parallax.[1] It is drifting further away from the Sun with a radial velocity of 16.65 km/s.[5]
This is a double-lined spectroscopic binary system with an essentially circular orbit and a period of one week.[5] The primary component is a chemically peculiar star of type CP1,[6] or Am star, with a stellar classification of A8m.[3] Abt and Morrell (1995) classed it as Am(A7/F0/F2),[4] indicating it has the hydrogen lines of an A7 star, the calcium K line of a cooler F0 star, and the metallic lines of an F2 class. It has been mentioned as a potential variable star.[9] The star has 3.6[1] times the girth of the Sun and is radiating 38 times the Sun's luminosity from its photosphere at an effective temperature of 7568 K.[1] It has a moderate rotation rate, with a projected rotational velocity of around 16 km/s.[6]
A third component was detected in 1987 using speckle interferometry at an angular separation of 0.04″.[5]
References
[edit]- ^ a b c d e f g h i j k Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c d Mendoza, E. E.; et al. (June 1978), "UBVRI photometry of 225 AM stars", Astronomical Journal, 83: 606–614, Bibcode:1978AJ.....83..606M, doi:10.1086/112242.
- ^ a b Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- ^ a b Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
- ^ a b c d e Fekel, Francis C.; et al. (November 2013), "New Precision Orbits of Bright Double-lined Spectroscopic Binaries. VIII. HR 1528, HR 6993, 2 Sagittae, and 18 Vulpeculae" (PDF), The Astronomical Journal, 146 (5): 20, Bibcode:2013AJ....146..129F, doi:10.1088/0004-6256/146/5/129, hdl:2152/34407, 129, retrieved 2019-12-15.
- ^ a b c Paunzen, E.; et al. (February 2013), "A photometric study of chemically peculiar stars with the STEREO satellites - II. Non-magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 429 (1): 119–125, arXiv:1211.1535, Bibcode:2013MNRAS.429..119P, doi:10.1093/mnras/sts318.
- ^ "HD 30453". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-15.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ Adelman, Saul J. (1998), "On the HIPPARCOS photometry of chemically peculiar B, A, and F stars", Astronomy and Astrophysics Supplement Series, 132: 93–97, Bibcode:1998A&AS..132...93A, doi:10.1051/aas:1998361.
