1998A&AS..129..337H


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.26CEST06:47:01

1998A&AS..129..337H - Astron. Astrophys., Suppl. Ser., 129, 337-341 (1998/April-2)

CCD photometry of YY Orionis stars.

HARDER S., BERTOUT C. and MENNESSIER C.

Abstract (from CDS):

Photometric UBVRI observations of the YY Orionis stars YY Ori, SY Ori, CE Ori, NS Ori and XX Ori are presented. The luminosity of all stars is variable on a timescale of a few days. This variation is rather irregular and no periodic variability was observed in the present data sets. The V-I and V-R colors become redder when the stars become fainter, suggesting that inhomogeneous surface temperature distributions are responsible for the observed irregular variability. Two stars located in the vicinity of our program stars and observed in the same frames turned out to be variable. They were identified as V481 Ori and AO Ori. We report a periodic modulation of the V481 Ori light curve with a period of 4.9 days.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: activity - stars: variables: other

VizieR on-line data: <Available at CDS (J/A+AS/129/337): tables.dat>

Status at CDS:  

CDS comments: p.338: star NGC 1977-38 misprint for NGC 1977 381

Simbad objects: 9

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Number of rows : 9

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* XX Ori Or* 05 34 36.1451212663 -06 05 34.699602384     14.20   13.617 M1.0 37 0
2 BD-06 1230 * 05 34 43.7457301974 -05 59 28.357713917   10.81 10.27     ~ 31 0
3 V* YY Ori Or* 05 34 47.5333702377 -05 57 56.956038462     13.20   12.95 K2IVe 122 0
4 V* V481 Ori Or* 05 35 09.0129645799 -04 27 51.092730903     13.1     ~ 23 0
5 V* SY Ori Or* 05 35 10.0825340730 -04 27 39.530452418     13.57     K2/3II/IIIe 41 0
6 V* NS Ori Or* 05 35 24.4885678410 -06 01 46.416082048     17.247   14.938 M2.5 36 0
7 V* AO Ori Or* 05 35 43.5523501579 -05 05 41.420340759     17.19   14.96 ~ 31 0
8 V* CE Ori Or* 05 35 48.3838835154 -05 01 28.853302124     15.20   13.50 K5e 41 0
9 Brun 946 *iN 05 36 05.07960 -04 59 42.7488   14.25 13.39 13.42   ~ 12 0

    Equat.    Gal    SGal    Ecl

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