Star in the constellation of Camelopardalis
HD 31134 , also designated asHR 1561 , is a solitarystar [ 14] circumpolar constellation Camelopardalis , the giraffe. It is faintly visible to thenaked eye as a white-hued star with anapparent magnitude of 5.74.[ 3] Gaia DR3 parallax measurements place it 473light years away.[ 2] Solar System with a heliocentricradial velocity ofkm/s [ 7] magnitudes due tointerstellar dust .[ 15] absolute magnitude of +0.19.[ 1]
The object has astellar classification of A2 Vs,[ 5] A-type main-sequence star with sharp or narrowabsorption lines due to slow rotation. Two sources remove thes prefix and instead list it as an ordinary dwarf star[ 16] [ 17] evolved giant star .[ 18] Ap star ,[ 6] [ 19] mass of the Sun and an enlargedradius of 4.38 R ☉ [ 8] luminosity of the Sun [ 4] photosphere at aneffective temperature ofK [ 9] main sequence lifetime[ 4] million years .[ 12] projected rotational velocity ofkm/s [ 11]
^a b c Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation".Astronomy Letters 38 (5): 331.arXiv :1108.4971 Bibcode :2012AstL...38..331A .doi :10.1134/S1063773712050015 . XHIP record for this object atVizieR .^a b c d e 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 atVizieR .^a b c d 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 . ^a b c d e Zorec, J.; Royer, F. (January 2012)."Rotational velocities of A-type stars IV: Evolution of rotational velocities" .Astronomy & Astrophysics .537 : A120.arXiv :1201.2052 Bibcode :2012A&A...537A.120Z .doi :10.1051/0004-6361/201117691 eISSN 1432-0746 .ISSN 0004-6361 .S2CID 55586789 . ^a b 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 . ^a b 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 . ^a b 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 . ^a b 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 . ^a b c 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 . ^ Anders, F.; et al. (August 2019)."Photo-astrometric distances, extinctions, and astrophysical parameters forGaia DR2 stars brighter thanG = 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 . ^a b Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (October 2002)."Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i" .Astronomy & Astrophysics .393 (3):897– 911.arXiv :astro-ph/0205255 Bibcode :2002A&A...393..897R .doi :10.1051/0004-6361:20020943 eISSN 1432-0746 .ISSN 0004-6361 . ^a b 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 . ^ "HR 1561" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedJanuary 3, 2023 .^ 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 . ^ 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 . ^ Appenzeller, Immo (April 1967)."MK Spectral Types for 185 Bright Stars" .Publications of the Astronomical Society of the Pacific .79 (467): 102.Bibcode :1967PASP...79..102A .doi :10.1086/128449 eISSN 1538-3873 .ISSN 0004-6280 . ^ Cucchiaro, A.; Macau-Hercot, D.; Jaschek, M.; Jaschek, C. (July 1978). "Spectral classification from the ultraviolet line features of S2/68 spectra. III. Early A-type stars".Astronomy and Astrophysics Supplement Series .33 :15– 26.Bibcode :1978A&AS...33...15C .ISSN 0365-0138 . ^ Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars".Royal Greenwich Observatory Bulletins .135 : 385.Bibcode :1968RGOB..135..385P . ^ Renson, P.; Manfroid, J. (19 March 2009)."Catalogue of Ap, HgMn and Am stars" .Astronomy & Astrophysics .498 (3):961– 966.Bibcode :2009A&A...498..961R .doi :10.1051/0004-6361/200810788 eISSN 1432-0746 .ISSN 0004-6361 .
