New variable stars in the direction of the bright cloud B in Sagittarius

Details New variable stars in the direction of the bright cloud B in Sagittarius New variable stars in the direction of the bright cloud B in Sagittarius

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...49..715t&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 49, Sept. 1982, p. 715-743.

Astronomy and Astrophysics

Astrophysics

7

Astronomical Catalogs, Sagittarius Constellation, Star Distribution, Stellar Magnitude, Variable Stars, Astrometry, Astronomical Coordinates, Astronomical Photography, Infrared Stars, Isophotes, Stellar Spectrophotometry

Scientific paper

621 new variable stars have been detected on plates obtained with the Schmidt telescopes of the Mount Palomar Observatory (1968) and of the European Southern Observatory (1976-1980).
The astrometrical measurements (ESO-CERN) and the photometrical ones (CDCA) which have followed the detection of the variable stars (Observatoire de Lyon) have led to determine the parameters α, δ, l, b, R(Max), R(Min), δm.
So we notice that:
- 379 variable stars have an amplitude of variation in magnitude between 0.5 and 2.0 (δm/N histogram).
- The number of variable stars strongly decreases towards the great amplitudes.
- The surface density of variable stars by square degree in this central galactic direction increases from 2 to 21 in the explored field of 5°.5 × 5°.5 size.

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