The Rotation Speed of the Companion Star in Aquila X-1

Bibcode
1997ouas.rept.....S
Shahbaz, T.; Casares, J.; Charles, P. A.
Bibliographical reference

Technical Report, OUAST/97/12 Dept. of Astrophysics

Advertised on:
1
1997
Number of authors
3
IAC number of authors
1
Citations
0
Refereed citations
0
Description
We have obtained medium resolution spectra of the neutron star X-ray transient Aql X-1 during quiescence. We determine the spectral type of the companion star to be K1 and also estimate its rotation speed to be 62(+30/-20) km/s. By measuring the width of the H-alpha emission line profile of the accretion disc, we estimate the binary inclination to approx. 50 deg and also estimate the semi-amplitude of the companion star's radial velocity curve to be approx. 170 km/s.
Type
Non-refereed
Companion stars
Neutron stars
Stellar rotation
Radial velocity

It may interest you

  • Non-refereed
    joshspeagle/dynesty: v3.0.0
    This is major release with several infrastructural changes that will make future development of dynesty easier, as well as significant speedups. The release also deprecated some rarely used options. Major refactor of the code that makes it easier to add new samplers. Major speedup of the uniform sampler when sampling in parallel You can now provide
    Koposov, Sergey et al.

    Advertised on:

    10
    2025
    Bibcode
    2025zndo..17268284K
    Citations
    1
  • Non-refereed
    (163) Erigone, (302) Clarissa, and (752) Sulamitis as seen with JWST's NIRSpec
    Primitive asteroids in the Main Belt possess one of the most pristine inventories of materials in the Solar System. Main Belt primitive asteroids are particularly interesting due to clear evidence of phyllosilicates, i.e., silicates that have encountered liquid water and undergone chemical alteration. Since asteroids are thought to be likely
    Harvison, Brittany et al.

    Advertised on:

    9
    2025
    Bibcode
    2025epsc.conf.1004H
    Citations
    0
  • Non-refereed
    NEOMIR: project statut of ESA's space-based infrared mission for NEO detection and early warning
    To warn about potential asteroid or comet impacts, we must first observe and discover these objects through dedicated NEO surveys. Most current and planned surveys are ground-based and use visible light, but they face limitations like weather dependency, limited sky visibility, difficulty detecting at low galactic latitudes, and inability to
    Conversi, Luca et al.

    Advertised on:

    9
    2025
    Bibcode
    2025epsc.conf.1329C
    Citations
    0