Ross 548
{{Short description|Variable star in the constellation Cetus}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A light curve for ZZ Ceti, adapted from Stover et al. (1980)
}}
{{Starbox observe
| constell = Cetus
| dec = {{DEC|−11|20|32.6318}}
| appmag_v = {{val|14.16|0.01}}
}}
{{Starbox character
| type = White dwarf
| variable = ZZ Cet (DAV)
}}
{{Starbox astrometry
| radial_v =
| parallax = 30.5249
| p_error = 0.0546
| absmag_v = {{val|11.78|0.06}}
}}
{{Starbox detail
| mass = {{val|0.65|0.02}}
| radius = {{val|0.0118|0.0002}}
| luminosity = {{val|0.0029|0.0002}}
| gravity = {{val|8.108|0.025}}
| temperature = {{val|12281|125|fmt=commas}}
| metal_fe =
| rotation = {{val|37.84|1.99|u=hours}}
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names = ZZ Cet, EGGR 10, G 271-106, G 272-52, LTT 873, NLTT 5358, WD 0133-116
}}
{{Starbox reference
| Simbad = ZZ+Cet
}}
{{Starbox end}}
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., pp. 891, 895.
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
{{reflist|refs=
{{Cite Gaia DR2|2457759374023232768}}
| title=ZZ Cet | access-date=2020-11-16 | postscript=. }}
| title=A New Analysis of the Two Classical ZZ Ceti White Dwarfs GD 165 and Ross 548. I. Photometry and Spectroscopy
| display-authors=1 | last1=Giammichele | first1=N.
| last2=Fontaine | first2=G. | last3=Bergeron | first3=P.
| last4=Brassard | first4=P. | last5=Charpinet | first5=S.
| last6=Pfeiffer | first6=B. | last7=Vauclair | first7=G.
| journal=The Astrophysical Journal
| volume=815 | issue=1 | id=56 | pages=12 | date=December 2015
| bibcode=2015ApJ...815...56G | doi=10.1088/0004-637X/815/1/56 | s2cid=125328132 }}
| title=A New Analysis of the Two Classical ZZ Ceti White Dwarfs GD 165 and Ross 548. II. Seismic Modeling
| last1=Giammichele | first1=N. | last2=Fontaine | first2=G.
| last3=Brassard | first3=P. | last4=Charpinet | first4=S.
| display-authors=1 | journal=The Astrophysical Journal Supplement Series
| volume=223 | issue=1 | id=10 | pages=27 | date=March 2016
| bibcode=2016ApJS..223...10G | doi=10.3847/0067-0049/223/1/10 | s2cid=124354534 | doi-access=free }}
| title=A Spectroscopic Survey and Analysis of Bright, Hydrogen-rich White Dwarfs
| display-authors=1 | last1=Gianninas | first1=A.
| last2=Bergeron | first2=P. | last3=Ruiz | first3=M. T.
| journal=The Astrophysical Journal
| volume=743 | issue=2 | id=138 | pages=27 | date=December 2011
| arxiv=1109.3171 | bibcode=2011ApJ...743..138G
| doi=10.1088/0004-637X/743/2/138 | s2cid=119210906 }}
| bibcode=1999ApJS..121....1M
| title=A Catalog of Spectroscopically Identified White Dwarfs
| first1=George P. | last1=McCook | first2=Edward M. | last2=Sion
| journal=Astrophysical Journal Supplement
| volume=121 | issue=1 | date=March 1999 | pages=1–130 | doi=10.1086/313186
| s2cid=122286998
| doi-access=free }}
CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?III/210 III/210].
| title=High-Frequency Stellar Oscillations. VI. R548, a Periodically Variable White Dwarf
| first1=Barry M. | last1=Lasker | first2=James E. | last2=Hesser
| journal=Astrophysical Journal
| volume=163 | date=February 1971 | pages=L89–L93
| doi=10.1086/180673 | bibcode=1971ApJ...163L..89L | doi-access=free }}
| display-authors=1 | title=58th Name-List of Variable Stars
| first1=B. V. | last1=Kukarkin | first2=P. N. | last2=Kholopov
| first3=N. P. | last3=Kukarkina | first4=N. B. | last4=Perova
| journal=Information Bulletin on Variable Stars
| volume=717 | date=September 21, 1972
| page=1
| bibcode=1972IBVS..717....1K }}
| title=Physics of white dwarf stars
| first1=D. | last1=Koester | first2=G. | last2=Chanmugam
| journal=Reports on Progress in Physics
| volume=53 | date=1990 | issue=7 | pages=837–915
| doi=10.1088/0034-4885/53/7/001 | bibcode=1990RPPh...53..837K | s2cid=250915046 }}
}}
{{Sky|01|36|13.60|-|11|20|32.2|250}}
{{Stars of Cetus}}
{{DEFAULTSORT:Ross 548}}