PHL 293B

PHL 293B
Hubble Space Telescope image of PHL 293B; the purported luminous blue variable is located near the core of the galaxy
Observation data (J2000 epoch)
ConstellationAquarius
Right ascension22h 30m 36.8s[1]
Declination−00° 06′ 37″[1]
Redshift0.0051[1]
Distance74 Mly (22.6 Mpc)[2]
Apparent magnitude (V)16.87[3]
Apparent magnitude (B)17.35[3]
Characteristics
TypeIm?[1]
Other designations
Kinman's Dwarf, PGC 69018[3]
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PHL 293B star
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
Distance22,600,000[2] pc
Details
Radius1,348–1,463[6] R☉
Luminosity2,500,000–3,500,000[6] L☉
Temperature6,000–6,800[6] K
Other designations
SDSS J2230–0006,[7] SDSS J223036.79-000636.9, A2228-00[8]
Database references
SIMBADPHL 293B
PHL 293 (Simbad mistakenly showing results for PHL 293B)

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]

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.

  1. ^ a b c d Kehrig, C.; Iglesias-Páramo, J.; Vílchez, J. M.; Gil De Paz, A.; Duarte Puertas, S.; Pérez-Montero, E.; Díaz, A. I.; Gallego, J.; Carrasco, E.; Cardiel, N.; García-Vargas, M. L.; Castillo-Morales, A.; Cedazo, R.; Gómez-Álvarez, P.; Martínez-Delgado, I.; Pascual, S.; Pérez-Calpena, A. (2020). "Mapping the ionized gas of the metal-poor H II galaxy PHL 293B with MEGARA" (PDF). Monthly Notices of the Royal Astronomical Society. 498 (2): 1638–1650. arXiv:2009.11600. doi:10.1093/mnras/staa2299.
  2. ^ a b c Cite error: The named reference kinman was invoked but never defined (see the help page).
  3. ^ a b c "PHL 293B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 August 2021.
  4. ^ a b French, H. B. (1980). "Galaxies with the spectra of giant H II regions". The Astrophysical Journal. 240: 41. Bibcode:1980ApJ...240...41F. doi:10.1086/158205.
  5. ^ Guseva, N. G.; Papaderos, P.; Meyer, H. T.; Izotov, Y. I.; Fricke, K. J. (2009). "An investigation of the luminosity-metallicity relation for a large sample of low-metallicity emission-line galaxies". Astronomy & Astrophysics. 505 (1): 63–72. arXiv:0908.2539. Bibcode:2009A&A...505...63G. doi:10.1051/0004-6361/200912414. S2CID 17490296.
  6. ^ a b c Cite error: The named reference allan was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference izotov was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference terlevich was invoked but never defined (see the help page).