A photometric and spectroscopic study of a supposed subclustering of pre-main sequence stars towards the Scorpius OB1 association

Details A photometric and spectroscopic study of a supposed subclustering of pre-main sequence stars towards the Scorpius OB1 association A photometric and spectroscopic study of a supposed subclustering of pre-main sequence stars towards the Scorpius OB1 association

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26as...92..609p&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 92, no. 3, Feb. 1992, p. 609-624.

Astronomy and Astrophysics

Astrophysics

2

Astronomical Photometry, Astronomical Spectroscopy, Pre-Main Sequence Stars, Star Clusters, Color-Color Diagram, Interstellar Extinction, Scorpius Constellation, Stellar Envelopes, Stellar Spectra, Variable Stars, Open Cluster, Photometry, Spectroscopy, Premain Sequence Stars

Scientific paper

We present and discuss VBLUW-, UBVRI-, and JHKLM-photometry and low-dispersion spectroscopy of roughly 30 stars selected from the list of Heske & Wendker (1984, 1985) in the supposed subclustering of pr&main sequence stars towards the OB association Scorpius OBi. We investigated the long term photometric variability, spectral characteristics, interstellar reddening and the possible presence of dust shells. It appears that the objects are at most mild pre-main sequence stars. Only four objects show an infrared excess due to a dust shell. There is no indication of important light variations. Based on the individual distances we tentatively conclude that most of the stars are scattered within a cylindrical space of 700 pc in length and 2.5 pc in diameter, located at about 1.1 kpc distance. We should mention here that the proposed distances to the Scorpius OB1 association lies between 1.6 and 2.3 kpc. However due to the large uncertainties in the individual distances, no definite conclusion regarding the physical relation of the programme stars can be made.

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