HD 33541

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]

HD 33541

Location of HD 33541 on the map (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
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 mas/yr[1] Dec.: −28.254 mas/yr[1]
Parallax (π)	9.0993 ± 0.0488 mas[1]
Distance	358 ± 2 ly (109.9 ± 0.6 pc)
Absolute magnitude (MV)	+0.58[5]
Orbit[6]
Primary	HD 33541A
Companion	HD 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
Mass	2.69±0.35[7] M☉
Radius	2.52±0.13[8] R☉
Luminosity	69.3±0.9[1] L☉
Surface gravity (log g)	4.09+0.07 −0.05[7] cgs
Temperature	11,200[9] K
Metallicity [Fe/H]	−0.15[10] dex
Rotational velocity (v sin i)	70[11] km/s
Age	300[12] Myr
Other designations
AG+73°141, BD+73°280, GC 6405, HD 33541, HIP 24732, HR 1683, SAO 5483[13]
Database references
SIMBAD	data

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. 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.
2. Oja, T. (August 1991). "UBV photometry of stars whose positions are accurately known. VI". Astronomy and Astrophysics Supplement Series. 89: 415. Bibcode:1991A&AS...89..415O. ISSN 0365-0138.
3. 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. Bibcode:1969AJ.....74..375C. doi:10.1086/110819. ISSN 0004-6256. S2CID 121555804.
4. 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. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
5. Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
6. 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. Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
8. 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. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361.
9. 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. Bibcode:1980A&AS...40..199P. ISSN 0365-0138.
10. 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. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
11. Dworetsky, Michael M. (November 1974). "Rotational Velocities of A0 Stars". The Astrophysical Journal Supplement Series. 28. American Astronomical Society: 101. Bibcode:1974ApJS...28..101D. doi:10.1086/190312. ISSN 0067-0049. S2CID 123416887.
12. Gontcharov, G. A. (December 2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. eISSN 1562-6873. ISSN 1063-7737. S2CID 118345778.
13. "HD 33541". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 18, 2023.
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. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. eISSN 1365-2966. ISSN 0035-8711. S2CID 14878976.
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. Bibcode:1995ApJS...99..135A. doi:10.1086/192182. ISSN 0067-0049. S2CID 120495962.
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.