The Unified Astronomy Thesaurus

Search Results

O subgiant stars original
dcterms created equal to or less than 2016-11-02T18:47:41.000Zequal to or more than 2016-11-02T18:47:41.000Z
dcterms modified equal to or less than 2018-02-06T18:12:32.000Zequal to or more than 2018-02-06T18:12:32.000Z
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O stars original
Subgiant stars original
Parallel field original
dcterms created equal to or less than 2016-11-02T13:41:33.000Zequal to or more than 2016-11-02T13:41:33.000Z
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Field of view original
B subgiant stars original
dcterms created equal to or less than 2016-11-02T18:47:51.000Zequal to or more than 2016-11-02T18:47:51.000Z
dcterms modified equal to or less than 2018-02-06T18:08:34.000Zequal to or more than 2018-02-06T18:08:34.000Z
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B stars original
Subgiant stars original
Star forming regions original
dcterms created equal to or less than 2016-11-02T13:48:20.000Zequal to or more than 2016-11-02T13:48:20.000Z
dcterms modified equal to or less than 2020-11-04T16:42:35.183Zequal to or more than 2020-11-04T16:42:35.183Z
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Star formation original
definition A region in the interstellar medium where processes of star formation are going on or have occurred in the past.
Blank fields original
dcterms created equal to or less than 2016-11-02T13:41:45.000Zequal to or more than 2016-11-02T13:41:45.000Z
dcterms modified equal to or less than 2018-09-13T19:35:12.000Zequal to or more than 2018-09-13T19:35:12.000Z
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Field of view original
Blue compact dwarf galaxies original
dcterms created equal to or less than 2016-11-01T17:29:34.000Zequal to or more than 2016-11-01T17:29:34.000Z
dcterms modified equal to or less than 2020-10-26T20:18:37.095Zequal to or more than 2020-10-26T20:18:37.095Z
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Compact dwarf galaxies original
definition An small irregular galaxy undergoing violent star formation activity. These objects appear blue by reason of containing clusters of hot, massive stars which ionize the surrounding interstellar gas. They are chemically unevolved since their metallicity is only 1/3 to 1/30 of the solar value.
Y dwarfs original
dcterms created equal to or less than 2016-11-02T16:04:07.000Zequal to or more than 2016-11-02T16:04:07.000Z
dcterms modified equal to or less than 2020-11-04T20:58:33.239Zequal to or more than 2020-11-04T20:58:33.239Z
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Brown dwarfs original
definition A type of ultra-cool brown dwarf with an effective temperature lower than 500 K. Near infrared spectra of these objects show deep absorption bands of H_{2}O and CH_4. So far only seven brown dwarf candidates belonging to this class have been found, all Y0 subtypes. These objects are very dim, with H magnitudes 19-23. The precise definition of the Y class requires new findings in the future about these objects.
DZ stars original
dcterms created equal to or less than 2017-01-23T19:32:01.000Zequal to or more than 2017-01-23T19:32:01.000Z
dcterms modified equal to or less than 2020-11-04T21:17:06.121Zequal to or more than 2020-11-04T21:17:06.121Z
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White dwarf stars original
definition A white dwarf whose spectrum shows metal lines only; no H or He.
DQ stars original
dcterms created equal to or less than 2017-01-23T19:34:10.000Zequal to or more than 2017-01-23T19:34:10.000Z
dcterms modified equal to or less than 2020-11-04T21:16:34.709Zequal to or more than 2020-11-04T21:16:34.709Z
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White dwarf stars original
definition A white dwarf whose spectrum shows carbon features of any kind.
Shell stars original
dcterms created equal to or less than 2017-01-23T20:12:14.000Zequal to or more than 2017-01-23T20:12:14.000Z
dcterms modified equal to or less than 2020-11-04T14:48:28.033Zequal to or more than 2020-11-04T14:48:28.033Z
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Chemically peculiar stars original
definition A main-sequence star, usually of spectral class B to F, whose spectrum shows bright emission lines superimposed on the normal absorption lines. The emission spectrum is explained by the presence of a circumstellar shell of gas surrounding the star at the equator. Shell stars are fast rotators.