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Dwarf galaxy in the constellation of Aquarius From Wikipedia, the free encyclopedia
PHL 293B, also known as Kinman's dwarf, is a low-metallicity blue compact dwarf galaxy about 22.6 Mpc from the Earth in the constellation Aquarius.[2]
PHL 293B | |
---|---|
Observation data (J2000 epoch) | |
Constellation | Aquarius |
Right ascension | 22h 30m 36.8s[1] |
Declination | −00° 06′ 37″[1] |
Redshift | 0.0051[1] |
Distance | 74 Mly (22.6 Mpc)[2] |
Apparent magnitude (V) | 16.87[3] |
Apparent magnitude (B) | 17.35[3] |
Characteristics | |
Type | Im?[1] |
Other designations | |
Kinman's Dwarf, PGC 69018[3] |
Observation data Epoch J1950 Equinox J1950 | |
---|---|
Constellation | Aquarius |
Right ascension | 22h 28.1m [4] |
Declination | −0° 22′[4] |
Characteristics | |
Evolutionary stage | Luminous blue variable? |
Astrometry | |
Radial velocity (Rv) | (of galaxy) 1,606[5] km/s |
Distance | 22,600,000[2] pc |
Details | |
Radius | 1,348–1,463[6] R☉ |
Luminosity | 2,500,000–3,500,000[6] L☉ |
Temperature | 6,000–6,800[6] K |
Other designations | |
Database references | |
SIMBAD | PHL 293B |
PHL 293 (Simbad mistakenly showing results for PHL 293B) |
It had a very likely associated, notable, blue-light, long-lived star with constant outbursts or a large supernova observed to have faded and which then disappeared. Although this bright visible jet-producing object responsible for broad hydrogen emission lines with P Cygni profiles was widely considered to be a luminous blue variable ejecting matter, other studies posited the mentioned, competing, explanations for the bright light source within.
PHL 293 was first listed as entry 293 in a catalogue of faint blue stars published by Guillermo Haro and Willem Jacob Luyten in 1962.[9] In 1965, Thomas Kinman observed two faint possible companions to it, about 1′ away, which he dubbed A and B. HL 293B, sometimes called Kinman's Dwarf, was noted to be an extragalactic, nonstellar object, with a jet, approximately 22.6 Mpc away from Earth.[2][8] The acronym PHL has since been applied to distinguish it from other HL catalogues; it is most commonly referred to by astronomers as PHL 293B.[4] The galaxy was identified as a blue compact dwarf, a type of small irregular galaxy undergoing a strong burst of star formation.[7]
The spectrum of PHL 293B is unusual both for its low metallicity and for broad hydrogen emission lines with P Cygni profiles. These are interpreted as being from a large luminous blue variable star in the galaxy. The star is believed to have been undergoing an outburst during previous observations,[7] an interpretation is disputed by some publications.[citation needed] An alternative explanation would be a long-lived type IIn supernova, similar to the transient event of SDSS1133.[10] These emission features in the spectrum of the galaxy faded during 2019 and by the end of the year had disappeared (at least visibly), likely due to the disappearance of a bright star of the galaxy.[6]
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