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]
Distance334 ± 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
Radius3.59+0.16
−0.45[1] R☉
Luminosity38.2±0.5[1] L☉
Temperature7,568+532
−160[1] K
Rotational velocity (v sin i)16.0±9.7[6] km/s
Other designations
BD+32°840, HD 30453, HIP 22407, HR 1528, SAO 57444[7]
Database references
SIMBADdata

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 kines 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

  1. 1 2 3 4 5 6 7 8 9 10 11 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.
  2. 1 2 3 4 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.
  3. 1 2 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
  4. 1 2 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.
  5. 1 2 3 4 5 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.
  6. 1 2 3 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.
  7. ↑ "HD 30453". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-12-15.
  8. ↑ 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.
  9. ↑ 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.
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