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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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Observation and Astrometry data

Constellation:Scorpius
Right ascension:16h14m13.32s
Declination:-18°50'12.5"
Apparent magnitude:8.666
Distance:108.342 parsecs
Proper motion RA:75.5
Proper motion Dec:-123.6
B-T magnitude:9.496
V-T magnitude:8.735

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 145917
TYCHO-2 2000TYC 6209-1330-1
USNO-A2.0USNO-A2 0675-15400690
HIPHIP 79580

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