Hints of the photometric period in radial velocity data of the X-ray binary HD 3191 with the Joan Oró telescope

• Published in: Astrophysics and space science 2023-02, Vol.368 (2), p.7, Article 7
• Main Authors: Martí, Josep, Luque-Escamilla, Pedro L., Sánchez-Ayaso, Estrella, Paredes, Josep M., Vázquez-Ramos, Alicia
• Format: Article
• Language: English
• Subjects: Accretion disks; Astrobiology; Astronomy; Astrophysics; Astrophysics and Astroparticles; Circular orbits; Cosmic rays; Cosmology; Gamma ray sources; Gamma rays; Mountains; Observations and Techniques; Observatories; Photometry; Physics; Physics and Astronomy; Radial velocity; Space Exploration and Astronautics; Space Sciences (including Extraterrestrial Physics; Spectroscopic observation; Spectroscopy; Telescopes; Velocity; Velocity curve; X ray binaries; X ray stars; X-rays
• ISSN: 0004-640X; 1572-946X
• DOI: 10.1007/s10509-023-04164-8

We focus our attention on the newly proposed X-ray binary system HD 3191 whose nature still lacks dynamical confirmation and accurate orbital parameters. The positional agreement of this object with a flaring gamma-ray source was the original motivation of this work, although the present chances of association are reduced. A long-term spectroscopic monitoring of HD3191 was conducted using the 1-m class, robotic, Joan Oró telescope at the Observatori Astronòmic del Montsec facilities, located in the pre-Pyrenees mountains 140 km away from Barcelona. The Doppler measurements suggest an agreement with the previously reported 16.09 d photometric period, as expected. We also present a very preliminary radial velocity curve based on a circular orbit solution that hints to a low velocity amplitude. Nevertheless, the instrumental limitations of our data render necessary to carry out improved spectroscopic observations to better discriminate among the nature of the compact companion.