Star in the constellation Draco
GRW +70 8247 is awhite dwarf star located 42 light-years fromEarth [ 1] constellation Draco . With amagnitude of about 13 it is visible only through a largetelescope .
Although photographed in the 19th century as part of theCarte du Ciel project, the star was not determined to be a white dwarf untilG. P. Kuiper observed it in 1934.[ 7] [ b] spectrum was thought to be almost featureless,[ 7] absorption bands .[ 11] [ 12] circularly polarized , it became the first white dwarf known to have amagnetic field .[ 13] [ 14] hydrogen absorption lines shifted by theZeeman effect .[ 6] [ 15] [ 16]
^a b c d e f 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 atVizieR .^a b "LAWD 73" .SIMBAD Centre de données astronomiques de Strasbourg . RetrievedNovember 5, 2007 .^ Wesemael, F.; Greenstein, J. L.; Liebert, James; Lamontagne, R.; Fontaine, G.; Bergeron, P.; Glaspey, J. W. (1993)."An atlas of optical spectra of white-dwarf stars" .Publications of the Astronomical Society of the Pacific .105 : 761.Bibcode :1993PASP..105..761W .doi :10.1086/133228 S2CID 122605705 . ^a b Mermilliod, J.-C. (1986)."Compilation of Eggen's UBV data, transformed to UBV (unpublished)" .Catalogue of Eggen's UBV Data .Bibcode :1986EgUBV........0M . ^ "GJ 742" .Montreal White Dwarf Database . Retrieved2024-05-30 .^a b Jesse L. Greenstein, Ronald J. W. Henry, and R. F. O'Connell (February 15, 1985)."Further identifications of hydrogen in Grw +70°8247" .Astrophysical Journal .289 :L25– L29.Bibcode :1985ApJ...289L..25G .doi :10.1086/184427 {{cite journal }}: CS1 maint: multiple names: authors list (link )^a b G. P. Kuiper (October 1934)."Two New White Dwarfs of Large Parallax" .Publications of the Astronomical Society of the Pacific .46 (273):287– 290.Bibcode :1934PASP...46..287K .doi :10.1086/124496 .S2CID 123421818 . ^ P. J. van Rhijn and J. J. Raimond (April 1934)."Some new members of the Hyades cluster" .Monthly Notices of the Royal Astronomical Society 94 (6):508– 518, at p. 517.Bibcode :1934MNRAS..94..508V .doi :10.1093/mnras/94.6.508 ^ Jöran M. Ramberg (May 1938)."Zwei weiße Zwerge unter den physischen Hyadenmigliedern" .Astronomische Nachrichten (in German).265 (6– 7):111– 112.Bibcode :1938AN....265..111R .doi :10.1002/asna.19382650609 . ^ See alsoGerard P. Kuiper (August 1941)."List of Known White Dwarfs" .Publications of the Astronomical Society of the Pacific .53 (314):248– 252.Bibcode :1941PASP...53..248K .doi :10.1086/125335 S2CID 123040354 . ^ Walter S. Adams and Frederick H. Seahes (1938)."Annual Report of the Director of the Mount Wilson Observatory (1937-1938)" .Mount Wilson Observatory Annual Report .10 : 28.Bibcode :1938MWOAR..10....1A . ^ Jesse L. Greenstein and Mildred S. Matthews (July 1957)."Studies of the White Dwarfs. I. Broad Features in White Dwarf Spectra" .Astrophysical Journal .126 :14– 18.Bibcode :1957ApJ...126...14G .doi :10.1086/146364 . ^ James C. Kemp, John B. Swedlund, J. D. Landstreet, and J. R. P. Angel (August 1970)."Discovery of Circularly Polarized Light from a White Dwarf" .Astrophysical Journal .161 :L77– L79.Bibcode :1970ApJ...161L..77K .doi :10.1086/180574 . {{cite journal }}: CS1 maint: multiple names: authors list (link )^ Angel, J.R.P.; Landstreet, J.D.; Oke, J.B. (1972)."The Spectral Dependence of Circular Polarization in Grw+70°8247" .Astrophysical Journal .171 :L11– L15.Bibcode :1972ApJ...171L..11A .doi :10.1086/180857 ^ J. R. P. Angel, James Liebert, and H. S. Stockman (May 1, 1985)."The optical spectrum of hydrogen at 160-350 million gauss in the white dwarf Grw +70°8247" .Astrophysical Journal .292 :260– 266.Bibcode :1985ApJ...292..260A .doi :10.1086/163156 . {{cite journal }}: CS1 maint: multiple names: authors list (link )^ D. T. Wickramasinghe and Lilia Ferrario (April 1, 1988)."A centered dipole model for the high field magnetic white dwarf GRW +70°8247" .Astrophysical Journal .327 :222– 233.Bibcode :1988ApJ...327..222W .doi :10.1086/166184
