Statistics – Computation
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...365...86r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 365, Dec. 10, 1990, p. 86-92.
Statistics
Computation
47
Astronomical Spectroscopy, Galactic Clusters, Galactic Evolution, Interacting Galaxies, Astronomical Models, H Alpha Line, H I Regions, Stellar Evolution, Stellar Mass, Wolf-Rayet Stars
Scientific paper
The compact group H31 was identified by Hickson in 1982; it consists of four galaxies in close proximity, at least two of which (A and C) are interacting. Red and H-alpha frames and long-slit spectroscopy identify at least three other close members of the group; an H I envelope encloses all galaxies. Nuclear spectra of galaxies A and C show velocity patterns characteristic of interacting galaxies as well as the broad 4650 A feature indicative of W-R stars. These features reveal that large numbers of massive stars formed more than 10 exp 6.5 yr ago. Other observed characteristics all suggest that H31 is in the process of merging to a single galaxy. H31 thus supports computations which indicate that galaxies in compact groups merge to form a single remnant.
Ford Kent Jr. W.
Hunter Deidre Ann
Rubin Vera Cooper
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