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HD 90980


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Near-infrared photometry of stars
Results are presented of infrared photometric observations performed oncomparison stars during a monitoring of long-period variables. Theseobservations, spread over a lapse of about 5 years, are used to derivethe J, H, and K magnitudes of 54 stars in the photometric systemdescribed by Koornneef (1983). The 1950.0 coordinates, spectral types,visual magnitudes, average magnitudes, and the number of observationsare given for each object.

Einstein Observatory magnitude-limited X-ray survey of late-type giant and supergiant stars
Results are presented of an extensive X-ray survey of 380 giant andsupergiant stars of spectral types from F to M, carried out with theEinstein Observatory. It was found that the observed F giants orsubgiants (slightly evolved stars with a mass M less than about 2 solarmasses) are X-ray emitters at the same level of main-sequence stars ofsimilar spectral type. The G giants show a range of emissions more than3 orders of magnitude wide; some single G giants exist with X-rayluminosities comparable to RS CVn systems, while some nearby large Ggiants have upper limits on the X-ray emission below typical solarvalues. The K giants have an observed X-ray emission level significantlylower than F and F giants. None of the 29 M giants were detected, exceptfor one spectroscopic binary.

Photometric standard sequences in Carina iII = 275° - 295°
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观测天体数据

星座:船底座
右阿森松:10h28m48.01s
赤纬:-57°13'58.8"
视星:6.689
距离:160.256 天文距离
右阿森松适当运动:-17.1
赤纬适当运动:19.5
B-T magnitude:8.026
V-T magnitude:6.8

目录:
适当名称   (Edit)
HD 1989HD 90980
TYCHO-2 2000TYC 8609-1080-1
USNO-A2.0USNO-A2 0300-09751380
HIPHIP 51307

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