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HD 39579


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관련 글

F, G and K stars in the ROSAT all-sky survey. I. Photometry
We present accurate BV(RI)_c photometry for a sample of F, G and K starsdetected in selected areas of the ROSAT all-sky survey (RASS). We haveused the photometry, in addition to low-resolution spectroscopy, toestimate spectral classifications, distances and X-ray luminosities. Thelog (L_X / L_V) in the sample lies below -2. Although the samplecontains also nearby, inactive stars, it is dominated by active objects.The median X-ray luminosity in our sample is < L_X > = 29.88 andthe mean value of the hardness ratios = 0.13 +/- 0.35. Wecompare the derived X-ray luminosity function with similar functionsobtained from the serendipitous samples of the Einstein Observatorymedium sensitivity survey (EMSS) and EXOSAT. Our sample is completelyconsistent with the EMSS sample of solar type stars, indicating thatboth our sources and the EMSS sources are representative of the highgalactic latitude X-ray stellar population. We do not find extremelyactive stars (log (L_X) >= 32), as are found in the EMSS sample, andwe argue that these objects are rare. Table 3 is also available inelectronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr(130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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관측 및 측정 데이터

별자리:화가자리
적경:05h49m41.23s
적위:-59°50'22.2"
가시등급:9.417
거리:141.443 파섹
적경상의 고유운동:0.5
적위상의 고유운동:32.7
B-T magnitude:10.031
V-T magnitude:9.468

천체목록:
일반명   (Edit)
HD 1989HD 39579
TYCHO-2 2000TYC 8532-1541-1
USNO-A2.0USNO-A2 0300-01901509
HIPHIP 27524

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