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The lightcurve of nova cygni 1975 (V 1500 Cyg) from the outburst to July 1977
Author(s) -
Tempesti Piero
Publication year - 1979
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19793000108
Subject(s) - physics , astrophysics , nova (rocket) , amplitude , observatory , light curve , astronomy , variation (astronomy) , photoelectric effect , optics , aeronautics , engineering
On the basis of photoelectric observations performed at the Teramo Observatory, the V lightcurve of Nova Cygni 1975 from August 1975 to July 1977 is given. Since three days after maximum thereafter, the decline pursued smoothly according the law V = 2.5 + 3.9 lg t , and 680 days after maximum the star had weakened by 12.5 mag. The well‐known shortperiod light variation, which at the time of the early decline showed an amplitude smaller than 0.2 mag in V light, on December 13, 1976, displayed an amplitude as high as 0.5 mag.