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@article{1373408,
author = {Groebel, Rainer and Huemmerich, Stefan and Paunzen, Ernst and Bernhard, Klaus},
article_location = {AMSTERDAM},
article_number = {January},
doi = {http://dx.doi.org/10.1016/j.newast.2016.07.012},
keywords = {Stars: chemically peculiar; Stars: variables: ACV; Stars: individual: HD 240121; NSV 25977},
language = {eng},
issn = {1384-1076},
journal = {New Astronomy},
title = {HD 240121-An ACV variable showing anti-phase variations of the B and V light curves},
volume = {50},
year = {2017}
}
TY - JOUR
ID - 1373408
AU - Groebel, Rainer - Huemmerich, Stefan - Paunzen, Ernst - Bernhard, Klaus
PY - 2017
TI - HD 240121-An ACV variable showing anti-phase variations of the B and V light curves
JF - New Astronomy
VL - 50
IS - January
SP - 104-108
EP - 104-108
PB - ELSEVIER SCIENCE BV
SN - 13841076
KW - Stars: chemically peculiar
KW - Stars: variables: ACV
KW - Stars: individual: HD 240121
KW - NSV 25977
N2 - The variability of HD 240121 = BD+59 2602 was first suspected by Sarg and Wramdemark (1970) and later confirmed by Grobel R. (1992a,b). Because of the observed anti-phase variations of the B and V light curves, the latter author tentatively suggested an ACV type. Apart from its inclusion in the catalog of New Suspected Variables (NSV 25977), no further investigations of the star have been published. HD 240121 was included into our target list of ACV candidates and investigated in order to determine the reason for the observed brightness variations. All available information on HD 240121 were collected via an exhaustive data mining procedure. Data from Grobel (1992a,b) were re-analysed and photometric observations from the NSVS and Hipparcos archives were procured and investigated. Line-of-sight reddening and stellar parameters were calculated from archival photometric data. HD 240121 is a young, late B-type CP2 star of the silicon subgroup. The observed period, amplitude of light variations and variability pattern (anti-phase variations) are typical of ACV variables. The occurrence of anti-phase variations of the B and V light curves is rarely observed and points to the existence of a null wavelength in the visual spectrum. We therefore strongly encourage further multi-colour photometric observations of this star. (C) 2016 Elsevier B.V. All rights reserved.
ER -
GROEBEL, Rainer, Stefan HUEMMERICH, Ernst PAUNZEN a Klaus BERNHARD. HD 240121-An ACV variable showing anti-phase variations of the B and V light curves. \textit{New Astronomy}. AMSTERDAM: ELSEVIER SCIENCE BV, 2017, roč.~50, January, s.~104-108. ISSN~1384-1076. Dostupné z: https://dx.doi.org/10.1016/j.newast.2016.07.012.
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