J/A+A/690/A231 GM Nor, V397 Pup, and PT Vel time of minimum (Wolf+, 2024)
Apsidal motion and TESS light curves of three southern close eccentric
eclipsing binaries: GM Nor, V397 Pup, and PT Vel.
Wolf M., Zasche P., Kara J., Zejda M., Janik J., Masek M., Lehky M.,
Merc J., Richterkova A., Hanzl D., Mikulasek Z., de Villiers S.N., Liska J.
<Astron. Astrophys. 690, A231 (2024)>
=2024A&A...690A.231W 2024A&A...690A.231W (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Radial velocities ; Optical
Keywords: binaries: eclipsing - stars: early-type -
stars: fundamental parameters - stars: individual: GM Nor -
stars: individual: V397 Pup - stars: individual: PT Vel
Abstract:
The study of apsidal motion in eccentric eclipsing binaries provides
an important observational test of theoretical models of stellar
structure and evolution. New ground-based and space-based photometric
data have been obtained and archival spectroscopic measurements were
used in this study of three detached early-type and
southern-hemisphere eccentric eclipsing binaries GM Nor (P=1.88d,
e=0.05), V397 Pup (3.00d, 0.30), and PT Vel (1.80d, 0.12). Their TESS
observations in several sectors have also been included and the
corresponding light curves were solved using the PHOEBE code. As a
result, new accurate photoelectric times of minimum light have been
obtained. The newly completed O-C diagrams were analyzed using
all reliable timings found in the literature and calculated using the
TESS light curves. New or improved values for the elements of apsidal
motion were obtained. Using ESO archive spectroscopy, for V397 Pup,
the precise absolute parameters were newly derived:
M1=3.076(35)M☉, M2=2.306(35)M☉, and R1=2.711(55)R☉,
R2=1.680(55)R☉. For PT Vel the absolute dimensions were
improved: M1=2.204(25)M☉, M2=1.638(25)M☉, and
R1=2.108(30)R☉, R2=1.605(30)R☉. For GM Nor, the less
accurate absolute parameters based on the light curve analysis were
evaluated: M1=1.94(15)M☉, M2=1.84(14)M☉, and
R1=2.27(20)R☉, R2=2.25(20)R☉. We found more precise and
relatively short periods of apsidal motion of about 80, 335, and 160
years, along with the corresponding internal structure constants, log
k2, -2.524, -2.361, and -2.563, for GM Nor, V397 Pup, and PT Vel,
respectively. Relativistic effects are small but not negligible,
making up to 10% of the total apsidal motion rate in all systems. No
marks of the presence of the third body were revealed in the light
curves, on the O-C diagrams, or in the reduced spectra of the
eccentric systems studied here.
Description:
This study provides accurate information on the apsidal motion rates,
absolute parameters, and observed ISC values for the three southern
detached binary systems GM Nor, V397 Pup, and PT Vel. All derived or
confirmed periods of apsidal motion are relatively short.
New times of minimum light and Radial velocities of V397 Pup
and PT Vel.
Objects:
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RA (2000) DE Designation(s)
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15 51 57.96 -55 21 48.2 GM Nor = TIC 81569380
07 49 14.64 -35 14 35.8 V397 Pup = HR 3049
09 10 57.71 -43 16 02.9 PT Vel = TIC 74528791
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 39 3 Studied stars
minima.dat 46 311 New times of minimum light of
GM Nor, V397 Pup and PT Vel
(tables A1-A5)
rv.dat 62 44 Radial velocities of V397 Pup and PT Vel derived
from archival HARPS and FEROS spectra
(table B1-B2)
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 11 I2 h RAh Simbad Right ascension (J2000)
13- 14 I2 min RAm Simbad Right ascension (J2000)
16- 20 F5.2 s RAs Simbad Right ascension (J2000)
22 A1 --- DE- Simbad declination sign (J2000)
23- 24 I2 deg DEd Simbad declination (J2000)
26- 27 I2 arcmin DEm Simbad declination (J2000)
29- 32 F4.1 arcsec DEs Simbad declination (J2000)
34- 36 I3 --- Nmin Number of measurements for time of minimum
38- 39 I2 --- NRV ? Number of measurements for radial velocities
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Byte-by-byte Description of file: minima.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star Name
10- 21 F12.6 d BJD Barycentric Julian date (BJD-2400000)
22 A1 --- n_BJD [*] * for mean value of UBV or VRI measurements
24- 30 F7.5 d e_BJD BJD error
31- 36 F6.1 --- Epoch Epoch
38- 46 A9 --- Source Source/Observatory
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Byte-by-byte Description of file: rv.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 14 A5 --- Inst Instrument (HARPS or FEROS)
16- 25 A10 "date" Date Observation date
27- 37 F11.5 d HJD Heliocentric Julian date (HJD-2400000
39- 44 F6.2 km/s RV1 Radial velocity of primary
46- 49 F4.2 km/s e_RV1 Radial velocity of primary error
51- 57 F7.2 km/s RV2 Radial velocity of secondary
59- 62 F4.2 km/s e_RV2 Radial velocity of secondary error
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Acknowledgements:
Marek Wolf, MarekWolf(at)seznam.cz
(End) Patricia Vannier [CDS] 08-Aug-2024