Astronomy:HD 33541

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Short description: Spectroscopic binary; Camelopardalis
HD 33541
Location of HD 33541 on the map (circled)
Observation data
Epoch J2000.0   Equinox (celestial coordinates)
Constellation Camelopardalis
Right ascension  05h 18m 13.24213s[1]
Declination +73° 16′ 05.1509″[1]
Apparent magnitude (V) 5.83±0.01[2]
Characteristics
Spectral type A0 V[3]
U−B color index −0.12[2]
B−V color index −0.04[2]
Astrometry
Radial velocity (Rv)9.9±3.2[4] km/s
Proper motion (μ) RA: −2.361[1] mas/yr
Dec.: −28.254[1] mas/yr
Parallax (π)9.0993 ± 0.0488[1] mas
Distance358 ± 2 ly
(109.9 ± 0.6 pc)
Absolute magnitude (MV)+0.58[5]
Orbit[6]
PrimaryHD 33541A
CompanionHD 33541B
Period (P)20.8199180±0.0000458 d
Eccentricity (e)0.245±0.006
Periastron epoch (T)2,457,388.471+0.002
−0.003 JD
Argument of periastron (ω)
(secondary)		108±1°
Semi-amplitude (K1)
(primary)		39.3±0.3 km/s
Semi-amplitude (K2)
(secondary)		38.0±0.3 km/s
Details
Mass2.69±0.35[7] M☉
Radius2.52±0.13[8] R☉
Luminosity69.3±0.9[1] L☉
Surface gravity (log g)4.09+0.07−0.05[7] cgs
Temperature11,200[9] K
Metallicity [Fe/H]−0.15[10] dex
Rotational velocity (v sin i)70[11] km/s
Age300[12] Myr
Other designations
BD+73°280, GC 6405, HD 33541, HIP 24732, HR 1683, SAO 5483[13]
Database references
SIMBADdata

HD 33541, also known as HR 1683, is a white-hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.83,[2] making it faintly visible to the naked eye. Gaia DR3 parallax measurements imply a distance of 358 light years[1] and it is currently receding with a heliocentric radial velocity of 9.9 km/s.[4] At its current distance HD 33541's brightness is diminished by 0.16 magnitudes due to interstellar extinction[14] and it has an absolute magnitude of +0.58.[5]

The object has a stellar classification of A0 V,[3] indicating that it is an ordinary A-type main-sequence star. It has 2.69 times the mass of the Sun[7] and 2.52 times the Sun's radius.[8] It radiates 69.3 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 11,200 K.[9] HD 33541 has an iron abundance 71% that of the Sun ([Fe/H] = −0.15)[10] and it is estimated to be 300 million years old.[12] The star spins modestly with a projected rotational velocity of 70 km/s.[11]

HD 33541 was originally considered to be a solitary star.[15] However, Abt & Morell (1995) suggested that HD 33541 may be a close binary with two components that each have rotational velocities of 10 km/s.[16] A later paper gives the rotational velocity of the primary as 60 km/s and of the secondary 11 km/s.[17] It is now considered to be a spectroscopic binary with a period of 20.8 hours and a somewhat eccentric orbit based on Gaia DR3 models.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI.". Astronomy and Astrophysics Supplement Series 89: 415. ISSN 0365-0138. Bibcode: 1991A&AS...89..415O. 
  3. ↑ 3.0 3.1 Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (April 1969). "A study of the bright stars. I. A catalogue of spectral classifications.". The Astronomical Journal 74: 375. doi:10.1086/110819. ISSN 0004-6256. Bibcode: 1969AJ.....74..375C. 
  4. ↑ 4.0 4.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. ISSN 1063-7737. Bibcode: 2006AstL...32..759G. 
  5. ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 Gaia Collaboration (2022). "VizieR Online Data Catalog: Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)". Vizier Online Data Catalog. Bibcode: 2022yCat.1357....0G. 
  7. ↑ 7.0 7.1 7.2 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  8. ↑ 8.0 8.1 Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants". Astronomy & Astrophysics 426 (1): 297–307. doi:10.1051/0004-6361:20035930. ISSN 0004-6361. Bibcode: 2004A&A...426..297K. 
  9. ↑ 9.0 9.1 Philip, A. G. D.; Egret, D. (May 1980). "An analysis of the Hauck-Mermillod catalogue of homogeneous four-color data. II.". Astronomy and Astrophysics Supplement Series 40: 199–205. ISSN 0365-0138. Bibcode: 1980A&AS...40..199P. 
  10. ↑ 10.0 10.1 Anders, F. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  11. ↑ 11.0 11.1 Dworetsky, Michael M. (November 1974). "Rotational Velocities of A0 Stars". The Astrophysical Journal Supplement Series (American Astronomical Society) 28: 101. doi:10.1086/190312. ISSN 0067-0049. Bibcode: 1974ApJS...28..101D. 
  12. ↑ 12.0 12.1 Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. ISSN 1063-7737. Bibcode: 2012AstL...38..771G. 
  13. ↑ "HD 33541". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+33541. 
  14. ↑ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society 472 (4): 3805–3820. doi:10.1093/mnras/stx2219. ISSN 0035-8711. Bibcode: 2017MNRAS.472.3805G. 
  15. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E. 
  16. ↑ 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. 
  17. ↑ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-Line Data Catalog: III/244. Originally Published in: 2005csss...13..571G 3244. Bibcode: 2005yCat.3244....0G. 



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