2007A&A...461..253S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST01:11:37

2007A&A...461..253S - Astronomy and Astrophysics, volume 461, 253-259 (2007/1-1)

Periodic radial velocity variations in RU Lupi.

STEMPELS H.C., GAHM G.F. and PETROV P.P.

Abstract (from CDS):

object{RU Lup} is a Classical T Tauri star with unusually strong emission lines, which has been interpreted as manifestations of accretion. Recently, evidence has accumulated that this star might have a variable radial velocity. We intended to investigate in more detail the possible variability in radial velocity using a set of 68 high-resolution spectra taken at the VLT (UVES), the AAT (UCLES) and the CTIO (echelle). Using standard cross-correlation techniques, we determined the radial velocity of RU Lup. We analysed these results with Phase-dispersion minimization and the Lomb-Scargle periodogram and searched for possible periodicities in the obtained radial velocities. We also analysed changes in the absorption line shapes and the photometric variability of RU Lup. Our analysis indicated that RU Lup exhibits variations in radial velocity with a periodicity of 3.71days and an amplitude of 2.17km/s. These variations can be explained by the presence of large spots, or groups of spots, on the surface of RU Lup. We also considered a low-mass companion and stellar pulsations as alternative sources for these variations but found these to be unlikely.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: starspots - stars: individual: RU Lupi - binaries: close

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* EK Eri BY* 04 20 38.6418116586 -06 14 45.579829233   7.036 6.154     K0III 107 0
2 V* DF Tau Or* 04 27 02.7917481241 +25 42 22.456361256 11.97 12.25 11.42 10.31 9.14 M3Ve 459 1
3 V* UZ Tau B TT* 04 32 42.82968 +25 52 31.4148   14.07 12.72 13.35   M1/3Ve 136 0
4 V* UZ Tau ** 04 32 43.02168 +25 52 30.9036           M4Ve+M1/3Ve 285 0
5 V* DQ Tau Or* 04 46 53.0577037389 +17 00 00.135310040 14.56 13.67 12.00 13.21   M1Ve 286 0
6 V* SU Aur Or* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 534 0
7 V* RW Aur TT* 05 07 49.5662483 +30 24 05.177426   10.86 9.60 9.95   K1/5e+K5e 708 0
8 V* MN Lup TT* 15 23 30.3994212749 -38 21 28.834461499     14.15     M0 22 0
9 CD-33 10685 Or* 15 45 12.8670160092 -34 17 30.646921079 12.47 11.56 10.224 9.60 8.685 K3Ve 217 1
10 V* RU Lup Or* 15 56 42.3109948086 -37 49 15.473469159 9.27 10.07 9.60     K7/M0e 382 0
11 HD 319139 BY* 18 14 10.4818974563 -32 47 34.516106830   11.47 10.68   9.11 K5+K7 290 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-01:11:37

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