BN Monocerotis: an N-Type Variable.

Abstract

view Abstract Citations (1) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS BN Monocerotis: an N-Type Variable. Edmondson, Frank K. ; Giclas, Henry Abstract Photographic, photovisual, and photo-red observations made with seven different telescopes at the Kirkwood, Lowell, and Harvard observatories are used to study the light and color variation of this N-type variable. Sequences based on polar comparisons are given for the three colors. The photographic light-curve, based on 154 observations, covers an interval of nearly 19 years. It shows a semiregular type of variation with an amplitude of 3 mag. The photovisual light-curve, based on 80 ob- servations, is in phase with the photographic light-curve, but the amplitude is only 1 mag. The p/ioto-re4 light-curve, based on 30 observations, has a stifi smaller amplitude. The variation seems to take place in cycles of 500 days; but smaller fluctuations of shorter period are also present. The color index varies from +4h1t to +6m. It is strongly correlated with the photographic magnitude and only slightly correlated with the photovisual magnitude. The red index varies from +5~5 to +7'~5 and is strongly correlated with the photographic magnitude. There is little or no correlation with the photo-red magnitude. Publication: The Astrophysical Journal Pub Date: July 1944 DOI: 10.1086/144631 Bibcode: 1944ApJ...100....1E full text sources ADS | data products SIMBAD (1)