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HD 38526


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Rotation periods of four T Tauri stars
BVR photometry of nine T Tauri and related stars was obtained on 13nights in January 1988, in an attempt to confirm reported periodicitiesand discover new ones. Each star was observed an average of six timesper night. Rotation periods previously reported for T Tau by Herbst etal.(1986) and HM 4 (LHα 332-20) and HM 30 (LHα 332-21) byBouvier et al.(1986) were confirmed. A periodicity of 1.28 days wasdiscovered for TW Hya; it was also the only star to show significantvariations during the course of a single night. Analysis of a similardataset for TW Hya obtained by Rucinski and Krautter (1983) shows asimilar periodic variation, but with a 1.8 day cycle. SU Aur, RY Tau, BFOri, V380 Ori, and Fu Ori all exhibited variability, but withoutdetectable periodicity. This is in agreement with a previous suggestionthat periodicity is more easily found in the later-typepre-main-sequence stars (i.e., later than about KO).

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Observation and Astrometry data

Constellation:Orion
Right ascension:05h46m49.80s
Declination:+09°39'46.6"
Apparent magnitude:7.674
Distance:216.92 parsecs
Proper motion RA:-2.8
Proper motion Dec:-17.4
B-T magnitude:9.005
V-T magnitude:7.784

Catalogs and designations:
Proper Names
HD 1989HD 38526
TYCHO-2 2000TYC 719-723-1
USNO-A2.0USNO-A2 0975-02001843
HIPHIP 27276

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