B19 — A Flare Star in Front of the NGC 7000 Aggregate

  • M. K. Tsvetkov
  • B. R. Pettersen
  • S. L. Hawley
Part of the Astrophysics and Space Science Library book series (ASSL, volume 143)


The North America-Pelican Nebulae are noted for a large number of active stars with Ha in emission. During the last two decades 73 flare stars were discovered in this aggregate. B19 is one of the most active and also the brightest. It is positioned several degrees away from the nebulosities (RA=20h 41m00s; Dec=+41°11’; 1950) and is seen projected against the Big Rift of the Milky Way. Figure 1 identifies B19=V1589 Cyg on Palomar Sky Survey blue and red prints, respectively. We note the presence of an extremely red star 20 arcsecs north of B19. It is considerably weaker in red and not visible at all in blue.


Solar Neighbourhood Active Star Balmer Line Flare Star Schmidt Telescope 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. Melikian, N.D., 1983, IBVS No. 2352.Google Scholar
  2. Pettersen, B.R., Tsvetkov, M.K., Hawley, S.L., Coleman, L.A., Amirkhanian, A.S., 1987, Astrofizika, in press.Google Scholar
  3. Tsvetkov, M.K., Erastova, L.K., Tsvetkova, K.P., 1975, IBVS No. 1002.Google Scholar

Copyright information

© Kluwer Academic Publishers 1988

Authors and Affiliations

  • M. K. Tsvetkov
    • 1
  • B. R. Pettersen
    • 2
  • S. L. Hawley
    • 3
  1. 1.Department of AstronomyAcademy of SciencesSofiaBulgaria
  2. 2.Institute of Theoretical AstrophysicsUniversity of OsloNorway
  3. 3.Department of AstronomyUniversity of TexasAustinUSA

Personalised recommendations