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The true rotational period of the Ap star HD 193722 = V 1584 Cyg
Author(s) -
Hildebrandt G.,
Scholz G.,
Lehmann H.,
Panov K.
Publication year - 1995
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.2103160104
Subject(s) - physics , astrophysics , star (game theory) , diagram , astronomy , rotation period , o type main sequence star , equivalent width , emission spectrum , stars , spectral line , k type main sequence star , t tauri star , mathematics , statistics
Photometric observations of the Ap star HD 193722 give unambiguous proofs for a rotational period of P =8.5297 days in contradiction to the earlier found value of P =1.13316 days. Spectroscopic measurements yield a line width equivalent to the value v sin i =44.5 km/s. Both findings show convincingly that HD 193722 is an evolved Ap star with a position in the giant region of the HR diagram. This place falls into a domain occupied by the hypothetic Maia sequence.