On the mass of the compact object in GRO J0422+32

Bibcode
1995MNRAS.276L..35C
Casares, J.; Martin, A. C.; Charles, P. A.; Martin, E. L.; Rebolo, R.; Harlaftis, E. T.; Castro-Tirado, A. J.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 276, Issue 3, pp. L35-L39.

Advertised on:
10
1995
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
7
IAC number of authors
3
Citations
56
Refereed citations
49
Description
We report the detection of the secondary star spectrum in the hard X-ray transient GRO J0422+32 during its lowest quiescent state. From the amplitude of the radial velocity curve we derive a mass function f(M)=0.85+/-0.30M_solar. We classify the companion star as type M2+/-2V which contributes 35+/-6 per cent of the total flux in the spectral range lambdalambda6000-6500 and 52+/-8 per cent in the range lambdalambda6700-7500. Ellipsoidal modulation fits to the I-band light curves constrain the inclination to be between 41 deg+/-6 deg and 43 deg+/-6 deg for mass ratios q(=M_x/M_c)=10-5. We show that the primary is likely to be a low-mass black hole with a probable mass of ~=2.5-5M_solar.
Type
Refereed
Accretion

It may interest you

  • Refereed
    An ultra-short-period super-Earth with an extremely high density and an outer companion
    We present the discovery and characterization of a new multi-planetary system around the Sun-like star K2-360 (EPIC 201595106). K2-360 was first identified in K2 photometry as the host of an ultra-short-period (USP) planet candidate with a period of 0.88 d. We obtained follow-up transit photometry, confirming the star as the host of the signal
    Livingston, John H. et al.

    Advertised on:

    11
    2024
    Bibcode
    2024NatSR..1427219L
    Citations
    0
  • Refereed
    Neural calibration of imaging Stokes polarimeters
    Current polarimetric calibration techniques derive the instrument modulation matrix by numerically fitting an instrumental model to measurements of a set of calibration Stokes vectors. These techniques are typically limited to an error on the retrieved normalized Stokes Q, U and V parameters, in the $1\times10^{-2}$ to $1\times10^{-3}$ range. This
    Iglesias, F. A. et al.

    Advertised on:

    8
    2024
    Bibcode
    2024BAAA...65..281I
    Citations
    0
  • Refereed
    Model-based identification of solar coronal mass ejections using deep neural networks
    Coronal mass ejections (CMEs) are a major driver of space weather and thus can have important negative technological and social impacts. To assess their geoeffectiveness once they are ejected, it is crucial their prompt identification in coronagraph images. In the last decade, deep neural networks (DNN) have experienced enormous improvements in
    Iglesias, F. A. et al.

    Advertised on:

    8
    2024
    Bibcode
    2024BAAA...65...17I
    Citations
    0