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LP 40-365 is a low-mass white dwarf star in the constellation Ursa Minor. It travels at high speed through the Milky Way and has a very unusual elemental composition, lacking hydrogen, helium or carbon. It may have been produced in a subluminous Type Iax supernova that failed to destroy its host star totally.[2] [4][5] The "LP" name is derived from the Luyten-Palomar proper motion catalogue in which it appeared in the 1960s.[6] Another catalog name for this star is "GD 492". [3] The star was cataloged as a Giclas object with the designation "GD 492" being assigned by Henry Giclas in 1970.[7]

LP 40-365

Tangential movement of LP 40-365 between 1955 and 1995. The field of view is 8 × 8 arcminutes.
Credit: Digitized Sky Survey
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Minor
Right ascension 14h 06m 35.45s[1]
Declination +74° 18′ 58.0″[1]
Apparent magnitude (V) 15.51 ± 0.09[2]
Characteristics
Spectral type D[2]
Astrometry
Radial velocity (Rv)498[2] km/s
Total velocity~546[2] km/s
Proper motion (μ) RA: −56 ± 7[2] mas/yr
Dec.: 148 ± 7[2] mas/yr
Distance632[3] pc
Absolute magnitude (MV)8.14+0.60
−0.90[2]
Details[2]
Mass0.14 ± 0.01 M☉
Radius0.078+0.040
−0.020 R☉
Surface gravity (log g)5.80+0.20
−0.35 cgs
Temperature10100+250
−350 K
Rotational velocity (v sin i)30.5 ± 2.0 km/s
Other designations
2MASS J14063545+7418579[3]
Database references
SIMBADdata

References


  1. Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
  2. Vennes, Stephane; Nemeth, Peter; Kawka, Adela; Thorstensen, John R.; Khalack, Viktor; Ferrario, Lilia; Alper, Erek H. (18 August 2017). "An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova". Science. 357 (6352): 680–683. arXiv:1708.05568. Bibcode:2017Sci...357..680V. doi:10.1126/science.aam8378. PMID 28818942.
  3. "GD 492". SIMBAD. Centre de données astronomiques de Strasbourg.
  4. "Science Press Release". Astroserver.org. Retrieved 17 August 2017.
  5. Javier Barbuzano (17 August 2017). "The White Dwarf That Survived". Sky & Telescope.
  6. Luyten, W. J. (1963–1981). "Proper Motion Survey with the 48 inch Schmidt Telescope". University of Minnesota.
  7. Giclas, Henry L.; Burnham, Robert; Thomas, Norman Gene (1970). "A list of white dwarf suspects III : Special objects of small proper motion from the Lowell survey". Bulletin of the Lowell Observatory. 7 (153): 183. Bibcode:1970LowOB...7..183G.



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