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The 74th Special Name-list of Variable Stars
We present the Name-list introducing GCVS names for 3153 variable starsdiscovered by the Hipparcos mission.
| Photometry of variable AFGL sources
Results of infrared photometric observations of 63 AFGL sources over thepast 9 years are presented. Using these data together with previousmeasurements of these stars, pulsation periods and mean photometriccharacteristics are determined. These stars are found to lie midwaybetween optically identified Mira variables and the radio-luminous OH/IRstars in their period distribution and photometric properties. For thesample as a whole, there is no evidence for sudden or transient behaviorsuch as a switch in pulsation mode. Rather, these stars suggest rapid,but continuous, evolution from shorter period Miras with weak mass lossto longer periods and larger mass-loss rates. The carbon-rich stars inthe sample have the same period distribution as the oxygen-rich stars.None of the carbon stars have periods as long as those of the very longperiod radio-luminous OH/IR stars.
| Photoelectric photometry of M-type stars
UBVRI photoelectric photometry was obtained for 110 M-type starscontained in the Caltech Two-Micron Survey and the revised AFGL Catalog.Of the 110 stars, 58 have a color index (B-R) greater than or equal to 4mag. A graph is given of (V-R) versus (V-I) for the present stars.
| The stellar component of the galaxy as seen by the AFGL infrared sky survey
The noise-limited magnitudes for the Air Force Geophysical Laboratory(AFGL) Infrared Sky Survey have been estimated by direct comparison withground-based observations. Using these limiting magnitudes, 'pruned'versions of the AFGL catalog have been generated. Infrared observationsof all the stellar objects seen at 11, 20, or 27 microns and astatistical sample of the stars seen only at 4 microns are reported.Analysis of the observations leads to estimates of the absolute 4 and 10microns magnitudes and space densities for the two clases of objects.The expected results from the Infrared Astronomical Satellite arereexamined.
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| Takýmyýldýz: | Basakci |
| Sað Açýklýk: | 13h35m32.04s |
| Yükselim: | -04°23'23.5" |
| Görünürdeki Parlaklýk: | 8.681 |
| Uzaklýk: | 10000000 parsek |
| özdevim Sað Açýklýk: | -16.5 |
| özdevim Yükselim: | 0.5 |
| B-T magnitude: | 10.637 |
| V-T magnitude: | 8.843 |
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NEWS@SKY (Science&Space News)
