Ross 548
Ross 548 is a white dwarf in the equatorial constellation of Cetus. With a mean apparent visual magnitude of 14.2 it is much too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of 107 light years from the Sun. It was found to be variable in 1970 and in 1972 it was given the variable star designation ZZ Ceti. This is a pulsating white dwarf of the DAV type that is the prototype of the ZZ Ceti variable class.
This DA-class white dwarf is the surviving core of a red giant star that ceased nuclear fusion while shedding its outer envelope. It has a (presumably) homogeneous core of carbon and oxygen, a relatively thin outer envelope of hydrogen, and a helium mantle. The object has 65% of the mass of the Sun, with 1.2% of the Sun's radius. It is radiating 0.3% of the luminosity of the Sun at an effective temperature of 12,281 K. Ross 548 is spinning with a period of ~38 hours. The dominant pulsation mode of this object has a period of 213.1326 seconds. It has up to 11 known pulsation modes in total.
References
- ^ Stover, R. J.; Hesser, James E.; Lasker, Barry M.; Nather, R. E.; Robinson, E. L. (September 1980). "Period stability of the pulsating white dwarf R 548 (=ZZ Ceti)". The Astrophysical Journal. 240: 865–870. Bibcode:1980ApJ...240..865S. doi:10.1086/158300.
- ^ 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 at VizieR.
- ^ Giammichele, N.; et al. (December 2015). "A New Analysis of the Two Classical ZZ Ceti White Dwarfs GD 165 and Ross 548. I. Photometry and Spectroscopy". The Astrophysical Journal. 815 (1): 12. Bibcode:2015ApJ...815...56G. doi:10.1088/0004-637X/815/1/56. S2CID 125328132. 56.
- ^ Gianninas, A.; et al. (December 2011). "A Spectroscopic Survey and Analysis of Bright, Hydrogen-rich White Dwarfs". The Astrophysical Journal. 743 (2): 27. arXiv:1109.3171. Bibcode:2011ApJ...743..138G. doi:10.1088/0004-637X/743/2/138. S2CID 119210906. 138.
- ^ McCook, George P.; Sion, Edward M. (March 1999). "A Catalog of Spectroscopically Identified White Dwarfs". Astrophysical Journal Supplement. 121 (1): 1–130. Bibcode:1999ApJS..121....1M. doi:10.1086/313186. S2CID 122286998. CDS ID III/210.
- ^ Giammichele, N.; et al. (March 2016). "A New Analysis of the Two Classical ZZ Ceti White Dwarfs GD 165 and Ross 548. II. Seismic Modeling". The Astrophysical Journal Supplement Series. 223 (1): 27. Bibcode:2016ApJS..223...10G. doi:10.3847/0067-0049/223/1/10. S2CID 124354534. 10.
- ^ "ZZ Cet". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-11-16.
{{cite web}}: CS1 maint: postscript (link) - ^ Lasker, Barry M.; Hesser, James E. (February 1971). "High-Frequency Stellar Oscillations. VI. R548, a Periodically Variable White Dwarf". Astrophysical Journal. 163: L89–L93. Bibcode:1971ApJ...163L..89L. doi:10.1086/180673.
- ^ Kukarkin, B. V.; et al. (September 21, 1972). "58th Name-List of Variable Stars". Information Bulletin on Variable Stars. 717: 1. Bibcode:1972IBVS..717....1K.
- ^ Koester, D.; Chanmugam, G. (1990). "Physics of white dwarf stars". Reports on Progress in Physics. 53 (7): 837–915. Bibcode:1990RPPh...53..837K. doi:10.1088/0034-4885/53/7/001. S2CID 250915046.
