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CCD Photometry and Classification of Stars in a Camelopardalis Area
The paper gives the results of seven-color CCD photometry in the lVilnius system of 1376 stars down to 15.5 mag in the area at theGalactic equator (ℓ = 146 °, l b = +2.6 °) inCamelopardalis. Photometric spectral and luminosity classes,interstellar extinctions and distances of the stars are determined.
| Mesures de vitesses radiales. VII. Accompagnement AU sol DU programme d'observation DU satellite Hipparcos. Radial velocities. VII. Ground based measurements for Hipparcos.
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| An unbiased survey of field star X-ray emission
To determine the X-ray luminosity function of normal stars, 1700 starsbrighter than 10th magnitude were surveyed by the imaging proportionalcounter aboard the Einstein Observatory. Seventy star positions werefound to contain excess X-ray counting rates. The number of stars persquare degree in a number of magnitude intervals was calculated as afunction of spectral type and luminosity class, and the total number ofstars for each spectral type brighter than magnitude 9.5 derived in thismanner was compared with the 1700-star sample. The agreement is good, asis that between the surface density of soft X-ray sources and the numberof stellar emitters predicted from the field star survey. It isconcluded that stars probably do not contribute significantly to thediffuse soft X-ray background. The findings are consistent with thenotion that stellar age and/or rotation velocity are importantdeterminants of stellar X-ray emission level.
| A spectrophotometric survey of stars along the Milky Way. IV
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Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1956ApJS....2..298M&db_key=AST
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Datos observacionales y astrométricos
| Constelación: | Jirafa |
| Ascensión Recta: | 03h58m49.86s |
| Declinación: | +57°27'03.2" |
| Magnitud Aparente: | 6.952 |
| Distancia: | 133.511 parsecs |
| Movimiento Propio en Ascensión Recta: | 31.6 |
| Movimiento Propio en Declinación: | -36.1 |
| B-T magnitude: | 7.062 |
| V-T magnitude: | 6.962 |
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