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HD 145917


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UBV(RI)C photometric monitoring of Orion population stars in the Southern Hemisphere
UBV(RI)C photometry on a sample of southern T Tauri stars, selected fromthe Herbig and Bell (1988) catalog, is reported and four new candidates(AS 205, Wa Oph/2, Wa Oph/3, and Wa CrA/2) for rotational modulation aresingled out from the sample. The color trend for the stars showingvariability is considered. Typically, colors become redder when the staris fainter, complying with the general behavior observed in T Tauristars. This can be interpreted as due to the (variable) presence ofsurface inhomogeneities (either dark or bright) or, in some cases, itcould also be consistent with the hypothesis of variable circumstellarextinction. Estimates of gross spot properties (e.g., temperature andfilling factor) are derived for the four stars showing possibleperiodicity, from the amplitudes of the variations observed at differentwavelengths, by use of a simple blackbody model.

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观测天体数据

星座:天蠍座
右阿森松:16h14m13.32s
赤纬:-18°50'12.5"
视星:8.666
距离:108.342 天文距离
右阿森松适当运动:75.5
赤纬适当运动:-123.6
B-T magnitude:9.496
V-T magnitude:8.735

目录:
适当名称   (Edit)
HD 1989HD 145917
TYCHO-2 2000TYC 6209-1330-1
USNO-A2.0USNO-A2 0675-15400690
HIPHIP 79580

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