J/PASP/133/H4201 Times of maxima for 23 delta Scuti stars (Poro+, 2021)
Observational and theoretical studies of 27 delta Scuti stars with investigation
of the period-luminosity relation.
Poro A., Paki E., Mazhari G., Sarabi S., Kahraman Alicavus F.,
Ahangarani Farahani F., Guilani H., Popov A.A., Zubareva A.M.,
Zarei Jalalabadi B., Nourmohammad M., Davoudi F., Sabaghpour Arani Z.,
Ghalee A.
<Publ. Astron. Soc. Pac. 133, H4201 (2021)>
=2021PASP..133h4201P 2021PASP..133h4201P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry, CCD ; Ephemerides
Keywords: stars: variables: delta Scuti - stars: oscillations -
techniques: photometric
Abstract:
The multi-color CCD photometric study of 27 delta Scuti stars is
presented. By using approximately three years of photometric
observations, we obtained the times of maxima and magnitude changes
during the observation time interval for each star. The ephemeris of
our delta Scuti star was calculated based on the Markov Chain Monte
Carlo (MCMC) method using the observed times of maxima and the period
of star' oscillations. We used the Gaia EDR3 parallaxes to calculate
the luminosities and also the absolute magnitudes of these delta Scuti
stars. The fundamental physical parameters of all studied stars, such
as mass and radius, were estimated. We determined the pulsation modes
of the stars based on the pulsation constants. Moreover, the
period-luminosity relation of delta Scuti stars was investigated and
discussed. Then, by using a machine learning classification, new P-L
relations for fundamental and overtone modes are presented.
Description:
The Kourovka Planet Search project (KPS) carried out the photometric
observations in the period 2012-2015. The KPS project utilized the
robotic MASTER-II-Ural and Rowe-Ackermann Schmidt Astrograph (RASA)
telescopes to search for new hot Jupiter exoplanets transiting their
host stars. The MASTER-II-Ural telescope is operated at the Kourovka
astronomical observatory of the Ural Federal University, Russia
(57° N, 59° E), with a pair of Hamilton catadioptric tubes and
a focal length of 400mm corresponding to an Apogee Alta U16M CCD
yielding an image scale of 1.8arcsec/pixel. The second telescope,
the RASA telescope, is a 279mm Celestron CGEM mounted with a focal
length of 620mm, installed at the private observatory Acton Sky
Portal, Massachusetts, USA (43° N, 71° W). This telescope is
equipped with an SBIG ST-8300M CCD camera, which processes an image
scale of 1.8arcsec/pix.
In this project, to investigate transiting exoplanets in a photometric
survey, three different fields were selected. The CCD Images for the
first field observations (named TF1) were collected with a robotic
MASTER-II-Ural telescope from May to August 2012, with 50s exposure
times in the R filter and 120s exposure times in the B and V filters.
The second field observations (named TF2) were obtained in 2013 and
2014 using MASTER-II-Ural telescope with 50s exposure times in the R
and V filters, and 120s exposure times in the B and I filters for
determination of the color indices of the stars. The second telescope
was involved in September 2014 with 50s exposure times in the R and
50s exposure times in the V filters. The third field (named TF3) was
observed only in the R filter with 50s exposure times by the RASA
telescope from January to April 2015. The MASTER-II-Ural telescope
also was used in BVRI in order to determine the color indices of the
stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 103 27 The Coordinates, magnitude, and distance of
our delta Scuti stars (from: Gaia EDR3)
tm/* . 27 Individual times of maxima
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [2MASS]
7- 22 A16 --- 2MASS 2MASS name (HHMMSSss+DDMMSSs)
24- 41 F18.14 deg RAdeg Right ascension (ICRS) a Ep=2016.0
43- 59 F17.14 deg DEdeg Declination (ICRS) a Ep=2016.0
61- 66 F6.3 mag Gmag Gaia EDR3 G magnitude
68- 75 F8.3 pc Dist ? Distance
77- 83 F7.3 pc e_Dist ? rms uncertainty on Dist
85-103 A19 --- FileName Name of the file with times of maximum
in subdirectory tm
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Byte-by-byte Description of file: tm/*
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Bytes Format Units Label Explanations
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1- 13 F13.5 d BJD Time of maximum (TDB)
15- 21 F7.5 d e_BJD Error of time of maximum
23 A1 --- Filter [RVB] Passband
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Acknowledgements:
Atila Poro, iotamiddleeast(at)yahoo.com
(End) Patricia Vannier [CDS] 15-Jun-2021