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A Photometric Search for Circumstellar Shell Variability and Pre-Main Sequence Delta Scuti Variables

Published online by Cambridge University Press:  12 April 2016

M. Breger  and
J. Hardorp
M. Breger
Affiliation:
Stony Brook

Abstract

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A light variability study in NGC 2264 shows that about 25 % of the pre-main sequence A and F stars show irregular short-period variability and/or brightness changes since 1953. There exists a good correlation between this variability and (other) shell indicators. The scatter in the pre-main sequence band in the color-magnitude diagram can be partially explained by shells and an age spread between 1 and 3 × 106 years is indicated. W 90, a star below the main sequence, has brightened by half a magnitude to V = 12.5 since 1953. The corresponding color variation suggests a ratio of total to selective extinction of about 9.

Type
I. New Phenomena in Very Cool, or Very Young, or Very Peculiar Variables
Information
International Astronomical Union Colloquium , Volume 15: New Directions and Frontiers in Variable Stars Research , 1971 , pp. 85 - 89
Copyright
Copyright © Cambridge University Press 1971

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