HD 240121-An ACV variable showing anti-phase variations of the
B and V light curves

J 2017

HD 240121-An ACV variable showing anti-phase variations of the B and V light curves

GROEBEL, Rainer, Stefan HUEMMERICH, Ernst PAUNZEN and Klaus BERNHARD

Basic information

Original name

HD 240121-An ACV variable showing anti-phase variations of the B and V light curves

Authors

GROEBEL, Rainer (276 Germany), Stefan HUEMMERICH (276 Germany), Ernst PAUNZEN (40 Austria, belonging to the institution) and Klaus BERNHARD (40 Austria)

Edition

New Astronomy, AMSTERDAM, ELSEVIER SCIENCE BV, 2017, 1384-1076

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

Netherlands

Confidentiality degree

není předmětem státního či obchodního tajemství

Impact factor

Impact factor: 0.920

RIV identification code

RIV/00216224:14310/17:00096197

Organization unit

Faculty of Science

DOI

http://dx.doi.org/10.1016/j.newast.2016.07.012

UT WoS

000384387500013

Keywords in English

Stars: chemically peculiar; Stars: variables: ACV; Stars: individual: HD 240121; NSV 25977

Abstract

V originále

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.

Links

3SGA5916, interní kód MU

Name: Hvězdy a hvězdokupy v Magellanových mračnech (Acronym: Webda MaC)

Investor: South-Moravian Region, Incoming grants

7AMB17AT030, research and development project

Name: Analýza hvězd se skvrnami pomocí kvalitních pozorovacích dat

Investor: Ministry of Education, Youth and Sports of the CR

Citovat

GROEBEL, Rainer, Stefan HUEMMERICH, Ernst PAUNZEN and Klaus BERNHARD. HD 240121-An ACV variable showing anti-phase variations of the B and V light curves. New Astronomy. AMSTERDAM: ELSEVIER SCIENCE BV, 2017, vol. 50, January, p. 104-108. ISSN 1384-1076. Available from: https://dx.doi.org/10.1016/j.newast.2016.07.012.

@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 and 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, vol.~50, January, p.~104-108. ISSN~1384-1076. Available from: https://dx.doi.org/10.1016/j.newast.2016.07.012.

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