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Red giants in open clusters. VIII. NGC 752
The results of an 18-year radial-velocity survey of 30 red giants in thefield of the open cluster NGC 752 are presented. The membership of 15stars is confirmed. Four spectroscopic binaries have been discoveredamong the members and three orbits have been determined for H75, 110 and208, with periods of 3321, 127 and 5276 days respectively. The binaryfrequency (27%) is normal. A search for additional members in a widesurrounding area (2degr ) yielded two possible new members: both areclump red giant candidates. The red giant distribution in thecolour-magnitude diagram is somewhat unusual, with a clump containing 8stars and a second, fainter feature extending to the blue, defined by 3or 4 stars, which is not accounted for by theoretical isochrones. Basedon observations collected at the Haute-Provence Observatory (France)
| Far-infrared emission from the intracluster medium
IRAS images of 56 clusters of galaxies are examined for evidence ofdiffuse, extended FIR emission at 60 and 100 microns. Of these 56clusters, five show evidence of FIR excess, but at low levels ofsignificance. For A496 and MKW 1, this excess is attributable to thepresence of a strong point source at or near the position of the centralcD galaxy. In A2344, the observed 100-micron excess is the result of thepresence of a foreground cirrus concentration which coincides with thecluster. Examination of the sample as a whole indicates that clustersexhibit excess FIR emission at the 2-sigma level for apertures 4 and 10arcmin in diameter. FIR luminosities range from about 1-0 exp 9 solarluminosities for the smallest aperture to about 10 exp 14 solarluminosities for the entire cluster.
| Spectra of Some Peculiar and Luminous Bright Stars
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973PASP...85..314C&db_key=AST
| The Spectra and Rotational Velocities of the Bright Stars of Draper Types B8-A2.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1954ApJ...119..146S&db_key=AST
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תצפית ומידע אסטרומטרי
| קבוצת-כוכבים: | אנדרומדה |
| התרוממות ימנית: | 01h51m01.45s |
| סירוב: | +37°33'15.1" |
| גודל גלוי: | 7.782 |
| מרחק: | 552.486 פארסק |
| תנועה נכונה: | 20.2 |
| תנועה נכונה: | -5.4 |
| B-T magnitude: | 9.798 |
| V-T magnitude: | 7.949 |
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