HD 30453

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 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]

  1. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aj83_606 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Abt1995 was invoked but never defined (see the help page).
  5. ^ a b c d e Cite error: The named reference Fekel2013 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Paunzen2013 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Adelman1998 was invoked but never defined (see the help page).