Ross 548
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cetus |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | Script error: No such module "val".[3] |
| Characteristics | |
| Evolutionary stage | White dwarf |
| Spectral type | DA4.0[4] |
| U−B Template:Engvar | −0.5[5] |
| B−V Template:Engvar | 0.2[5] |
| Variable type | ZZ Cet (DAV)[5] |
| Astrometry | |
| Proper motion (μ) | RA: +460.845[2] mas/yr Dec.: −116.448[2] mas/yr |
| Parallax (π) | 30.5249±0.0546 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | Script error: No such module "val".[6] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Rotation | Script error: No such module "val". |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| ZZ Cet, EGGR 10, G 271-106, G 272-52, LTT 873, NLTT 5358, WD 0133-116[7] | |
| Database references | |
| SIMBAD | data |
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Ross 548 is a white dwarf in the equatorial constellation of Cetus.[7] With a mean apparent visual magnitude of 14.2[3] 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.[2] It was found to be variable in 1970[8] and in 1972 it was given the variable star designation ZZ Ceti.[9] This is a pulsating white dwarf of the DAV type that is the prototype of the ZZ Ceti variable class.[10], pp. 891, 895.[3]
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.[6] The dominant pulsation mode of this object has a period of 213.1326 seconds. It has up to 11 known pulsation modes in total.[3]
References
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- ↑ a b c Script error: No such module "Citation/CS1". CDS ID III/210.
- ↑ a b c Script error: No such module "Citation/CS1".
- ↑ a b Template:Cite simbad
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