New orbital ephemerides for the dipping source 4U 1323-619: Constraining the distance to the source

Tiziana Di Salvo, Marco Matranga, Rosario Iaria, Angelo Francesco Gambino, Riggio, Pintore, Sanna, Del Santo, Burderi

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4 Citazioni (Scopus)

Abstract

Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed. Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivative to compare the observed luminosity with that predicted by the theory of secular evolution. Methods: We took the advantage of about 26 yrs of X-ray data and grouped the selected observations when close in time. We folded the light curves and used the timing technique, obtaining 12 dip arrival times. We fit the delays of the dip arrival times both with a linear and a quadratic function. Results: We locate 4U 1323-619 within a circular area centred at RA (J2000) = 201.6543° and Dec (J2000) = -62.1358° with an associated error of 0.0002°, and confirm the detection of the IR counterpart already discussed in literature. We estimate an orbital period of P = 2.9419156(6) h compatible with the estimations that are present in the literature, but with an accuracy ten times higher. We also obtain a constraint on the orbital period derivative for the first time, estimating Ṗ = (8 ± 13) × 10^{-12} s/s. Assuming that the companion star is in thermal equilibrium in the lower main sequence, and is a neutron star of 1.4 M⊙, we infer a mass of 0.28 ± 0.03 M⊙ for the companion star. Assuming a distance of 10 kpc, we obtained a luminosity of (4.3 ± 0.5) × 10^{36} erg/s, which is not in agreement with what is predicted by the theory of secular evolution. Using a 3D extinction map of the Ks radiation in our Galaxy, we obtain a distance of 4.2^{+0.8}_{-0.7} kpc at 68% confidence level. This distance implies a luminosity estimation of (0.8 ± 0.3) × 10^{36} erg/s, which is consistent with the adopted scenario in which the companion star is in thermal equilibrium.
Lingua originaleEnglish
pagine (da-a)A34-
Numero di pagine9
RivistaASTRONOMY & ASTROPHYSICS
Volume589
Stato di pubblicazionePublished - 2016

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ephemerides
dipping
dip
companion stars
arrival time
orbitals
erg
luminosity
arrivals
extinction
x rays
neutron stars
light curve
confidence
bursts
estimating
time measurement
galaxies
radiation
estimates

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cita questo

@article{99ad62a540cf48f2856036952062cc41,
title = "New orbital ephemerides for the dipping source 4U 1323-619: Constraining the distance to the source",
abstract = "Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed. Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivative to compare the observed luminosity with that predicted by the theory of secular evolution. Methods: We took the advantage of about 26 yrs of X-ray data and grouped the selected observations when close in time. We folded the light curves and used the timing technique, obtaining 12 dip arrival times. We fit the delays of the dip arrival times both with a linear and a quadratic function. Results: We locate 4U 1323-619 within a circular area centred at RA (J2000) = 201.6543° and Dec (J2000) = -62.1358° with an associated error of 0.0002°, and confirm the detection of the IR counterpart already discussed in literature. We estimate an orbital period of P = 2.9419156(6) h compatible with the estimations that are present in the literature, but with an accuracy ten times higher. We also obtain a constraint on the orbital period derivative for the first time, estimating Ṗ = (8 ± 13) × 10^{-12} s/s. Assuming that the companion star is in thermal equilibrium in the lower main sequence, and is a neutron star of 1.4 M⊙, we infer a mass of 0.28 ± 0.03 M⊙ for the companion star. Assuming a distance of 10 kpc, we obtained a luminosity of (4.3 ± 0.5) × 10^{36} erg/s, which is not in agreement with what is predicted by the theory of secular evolution. Using a 3D extinction map of the Ks radiation in our Galaxy, we obtain a distance of 4.2^{+0.8}_{-0.7} kpc at 68{\%} confidence level. This distance implies a luminosity estimation of (0.8 ± 0.3) × 10^{36} erg/s, which is consistent with the adopted scenario in which the companion star is in thermal equilibrium.",
author = "{Di Salvo}, Tiziana and Marco Matranga and Rosario Iaria and Gambino, {Angelo Francesco} and Riggio and Pintore and Sanna and {Del Santo} and Burderi",
year = "2016",
language = "English",
volume = "589",
pages = "A34--",
journal = "ASTRONOMY & ASTROPHYSICS",
issn = "1432-0746",

}

TY - JOUR

T1 - New orbital ephemerides for the dipping source 4U 1323-619: Constraining the distance to the source

AU - Di Salvo, Tiziana

AU - Matranga, Marco

AU - Iaria, Rosario

AU - Gambino, Angelo Francesco

AU - Riggio, null

AU - Pintore, null

AU - Sanna, null

AU - Del Santo, null

AU - Burderi, null

PY - 2016

Y1 - 2016

N2 - Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed. Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivative to compare the observed luminosity with that predicted by the theory of secular evolution. Methods: We took the advantage of about 26 yrs of X-ray data and grouped the selected observations when close in time. We folded the light curves and used the timing technique, obtaining 12 dip arrival times. We fit the delays of the dip arrival times both with a linear and a quadratic function. Results: We locate 4U 1323-619 within a circular area centred at RA (J2000) = 201.6543° and Dec (J2000) = -62.1358° with an associated error of 0.0002°, and confirm the detection of the IR counterpart already discussed in literature. We estimate an orbital period of P = 2.9419156(6) h compatible with the estimations that are present in the literature, but with an accuracy ten times higher. We also obtain a constraint on the orbital period derivative for the first time, estimating Ṗ = (8 ± 13) × 10^{-12} s/s. Assuming that the companion star is in thermal equilibrium in the lower main sequence, and is a neutron star of 1.4 M⊙, we infer a mass of 0.28 ± 0.03 M⊙ for the companion star. Assuming a distance of 10 kpc, we obtained a luminosity of (4.3 ± 0.5) × 10^{36} erg/s, which is not in agreement with what is predicted by the theory of secular evolution. Using a 3D extinction map of the Ks radiation in our Galaxy, we obtain a distance of 4.2^{+0.8}_{-0.7} kpc at 68% confidence level. This distance implies a luminosity estimation of (0.8 ± 0.3) × 10^{36} erg/s, which is consistent with the adopted scenario in which the companion star is in thermal equilibrium.

AB - Context. 4U 1323-619 is a low mass X-ray binary system that shows type I X-ray bursts and dips. The most accurate estimation of the orbital period is 2.941923(36) h and a distance from the source that is lower than 11 kpc has been proposed. Aims: We aim to obtain the orbital ephemeris, the orbital period of the system, as well as its derivative to compare the observed luminosity with that predicted by the theory of secular evolution. Methods: We took the advantage of about 26 yrs of X-ray data and grouped the selected observations when close in time. We folded the light curves and used the timing technique, obtaining 12 dip arrival times. We fit the delays of the dip arrival times both with a linear and a quadratic function. Results: We locate 4U 1323-619 within a circular area centred at RA (J2000) = 201.6543° and Dec (J2000) = -62.1358° with an associated error of 0.0002°, and confirm the detection of the IR counterpart already discussed in literature. We estimate an orbital period of P = 2.9419156(6) h compatible with the estimations that are present in the literature, but with an accuracy ten times higher. We also obtain a constraint on the orbital period derivative for the first time, estimating Ṗ = (8 ± 13) × 10^{-12} s/s. Assuming that the companion star is in thermal equilibrium in the lower main sequence, and is a neutron star of 1.4 M⊙, we infer a mass of 0.28 ± 0.03 M⊙ for the companion star. Assuming a distance of 10 kpc, we obtained a luminosity of (4.3 ± 0.5) × 10^{36} erg/s, which is not in agreement with what is predicted by the theory of secular evolution. Using a 3D extinction map of the Ks radiation in our Galaxy, we obtain a distance of 4.2^{+0.8}_{-0.7} kpc at 68% confidence level. This distance implies a luminosity estimation of (0.8 ± 0.3) × 10^{36} erg/s, which is consistent with the adopted scenario in which the companion star is in thermal equilibrium.

UR - http://hdl.handle.net/10447/179094

M3 - Article

VL - 589

SP - A34-

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 1432-0746

ER -