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GRO J1744−28, search for the counterpart: infrared photometry and spectroscopy

Identifieur interne : 009159 ( Main/Exploration ); précédent : 009158; suivant : 009160

GRO J1744−28, search for the counterpart: infrared photometry and spectroscopy

Auteurs : A. J. Gosling [Royaume-Uni] ; R. M. Bandyopadhyay [États-Unis] ; J. C. A. Miller-Jones [Pays-Bas] ; S. A. Farrell [Australie, France]

Source :

RBID : ISTEX:1117D45B1AB2394ACE911FB161A693411691F560

Descripteurs français

English descriptors

Abstract

Using VLT/ISAAC, we have detected two candidate counterparts to the bursting pulsar GRO J 1744−28, one bright and one faint, both within the X‐ray error circles found using XMM–Newton and Chandra. In determining the spectral types of the counterparts we applied three different extinction corrections; one for an all‐sky value, one for a Galactic bulge value and one for a local value. We find that the local value, with an extinction law of α= 3.23 ± 0.01 is the only correction that results in colours and magnitudes for both the bright and faint counterparts that are consistent with a small range of spectral types, and in the case of the bright counterpart are also consistent with the spectroscopic identification. Photometry of the fainter candidate then indicates that it is a K7/M0 V star at a distance of 3.75 ± 1 kpc. Such a star would require a very low inclination angle (i < 9°) to satisfy the mass function constraints; however, this source cannot be excluded as the counterpart without follow‐up spectroscopy to detect emission signatures of accretion. Photometry and spectroscopy of the bright candidate indicate that it is most likely a G/K III star. The spectrum does not show Brackett‐γ emission, a known indicator of accretion. The bright star's magnitudes are in agreement with the constraints placed on the probable counterpart by the calculations of Rappaport & Joss for an evolved star that has had its envelope stripped. The mass function indicates that the most likely counterpart has M < 0.3 M⊙ for an inclination of i≥ 15°; a stripped giant, or a main‐sequence M3+V star would be consistent with this mass function constraint. In both cases mass transfer, if present, will be by wind accretion as the counterpart will not fill its Roche lobe given the observed orbital period. In this case, the derived magnetic field strength of 2.4 × 1011 G is sufficient to inhibit accretion of captured material by the propeller effect, hence the quiescent state of the system.

Url:
DOI: 10.1111/j.1365-2966.2007.12152.x


Affiliations:


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<term>Propeller effect</term>
<term>Propeller regime</term>
<term>Quiescent state</term>
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<term>Rappaport joss</term>
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<term>Star colours</term>
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<div type="abstract" xml:lang="en">Using VLT/ISAAC, we have detected two candidate counterparts to the bursting pulsar GRO J 1744−28, one bright and one faint, both within the X‐ray error circles found using XMM–Newton and Chandra. In determining the spectral types of the counterparts we applied three different extinction corrections; one for an all‐sky value, one for a Galactic bulge value and one for a local value. We find that the local value, with an extinction law of α= 3.23 ± 0.01 is the only correction that results in colours and magnitudes for both the bright and faint counterparts that are consistent with a small range of spectral types, and in the case of the bright counterpart are also consistent with the spectroscopic identification. Photometry of the fainter candidate then indicates that it is a K7/M0 V star at a distance of 3.75 ± 1 kpc. Such a star would require a very low inclination angle (i < 9°) to satisfy the mass function constraints; however, this source cannot be excluded as the counterpart without follow‐up spectroscopy to detect emission signatures of accretion. Photometry and spectroscopy of the bright candidate indicate that it is most likely a G/K III star. The spectrum does not show Brackett‐γ emission, a known indicator of accretion. The bright star's magnitudes are in agreement with the constraints placed on the probable counterpart by the calculations of Rappaport & Joss for an evolved star that has had its envelope stripped. The mass function indicates that the most likely counterpart has M < 0.3 M⊙ for an inclination of i≥ 15°; a stripped giant, or a main‐sequence M3+V star would be consistent with this mass function constraint. In both cases mass transfer, if present, will be by wind accretion as the counterpart will not fill its Roche lobe given the observed orbital period. In this case, the derived magnetic field strength of 2.4 × 1011 G is sufficient to inhibit accretion of captured material by the propeller effect, hence the quiescent state of the system.</div>
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