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HD 23331


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Optical identifications of IRAS point sources - The Fornax, Hydra I and Coma clusters
Optical identifications are presented for 66 IRAS point sources in theregion of the Fornax cluster of galaxies, 106 IRAS point sources in theregion of the Hydra I cluster of galaxies (Abell 1060), and 59 IRASpoint sources in the region of the Coma cluster of galaxies (Abell1656). Eight other sources in Hydra I do not have optical counterpartsand are very probably due to IR cirrus. Twenty-three (35 percent) of theFornax sources are associated with stars and 43 (65 percent) withgalaxies; 48 (42 percent) of the Hydra I sources are associated withstars and 58 (51 percent) with galaxies; 18 (31 percent) of the Comasources are associated with stars and 41 (69 percent) with galaxies. Thestellar and infrared cirrus surface density is consistent with thegalactic latitude of each field.

Correlations between NH3(1,1) and far-IR emission
NH3 (1,1 and 2,2) observations obtained using a 1024-channelautocorrelator and K-band maser amplifier at the 100-m Effelsberg radiotelescope (angular resolution 40 arcsec at 1.3 cm; velocity resolution0.16 km/s; rms error 0.1 K) are reported for six Taurus-region IRASsources for which the 100-micron flux is greater than the 60-micronflux. The data are presented in maps and tables and compared with theIRAS FIR data in graphs. A strong correlation between the NH3 lineintensity and the 100-micron flux and an anticorrelation between peakmain-beam brightness temperature and Delta-V (where V is the linevelocity) are observed and found to be consistent with the hypothesis ofHenriksen and Turner (1984), that the velocity field in molecular cloudsis controlled by star/cloud turbulence, with a conversion of small-scaleangular momentum to larger-scale turbulence.

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Datos observacionales y astrométricos

Constelación:Horno
Ascensión Recta:03h43m09.64s
Declinación:-32°31'45.4"
Magnitud Aparente:7.772
Distancia:254.453 parsecs
Movimiento Propio en Ascensión Recta:17.7
Movimiento Propio en Declinación:26.4
B-T magnitude:9.169
V-T magnitude:7.888

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 23331
TYCHO-2 2000TYC 7031-93-1
USNO-A2.0USNO-A2 0525-01287801
HIPHIP 17372

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