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The Interstellar Ti II Distance Scale

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Abstract

We measured the equivalent widths (\(EW\)s) of interstellar Ti II absorption lines at \(\lambda\) 3383.759 for about 250 reddened objects and found a good correlation of the \(EW\)s with distances to the background stars, estimated using Gaia DR3 parallaxes. Hipparcos trigonometric parallaxes were used for very bright objects which were not observed by Gaia. The Ti II based distance estimation procedure is similar to the well known Ca II-method (Megier et al., 2005, 2009). However, there are at least 3 advantages of the Ti II method: in contrast to interstellar Ca II H and K lines, blending of Ti II with stellar lines is not an issue even for late B stars; Ti II is to a much less extent influenced by the saturation effect; only a single line must be measured, i.e. there is only a single measurement error to be taken into account. The relation of between Ti II \(EW\) and distance is given by simple equation \(d\approx 30EW\), where \(d\) is the distance in pc and \(EW\) is the equivalent width of the Ti II \(\lambda\) 3383.759 line in mÅ.

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Notes

  1. For details see https://www.eso.org/sci/facilities/paranal/ instruments/uves.html

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ACKNOWLEDGMENTS

This research has made use of the services of the ESO Science Archive Facility and the SIMBAD database, operated at CDS, Strasbourg, France (https://simbad.unistra.fr/simbad/) and partially based on observations collected at the European Southern Observatory under ESO programmes 65.I-0379 (A), 68.C-0024 (A), 078.C-0403 (A), 194.C-0833 (A), 0102.C-0699 (A), 106.20WN.001.

Funding

GAG made data processing and analysis with the aid of instruments developed at Special Astrophysical Observatory with the financial support of grant No. 075-15-2022-262 (13.MNPMU.21.0003) of the Ministry of Science and Higher Education of the Russian Federation.

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Authors and Affiliations

  1. Crimean Astrophysical Observatory, Russian Academy of Sciences, 298409, Nauchny, Russia

    G. A. Galazutdinov & E. Babina

  2. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Russia

    G. A. Galazutdinov

  3. Universidad Católica del Norte, 1249004, Antofagasta, Chile

    T. A. Santander

  4. University of Rzeszów, 35-310, Rzeszów, Poland

    J. Krełowski

Authors
  1. G. A. Galazutdinov
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  2. T. A. Santander
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  3. E. Babina
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  4. J. Krełowski
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Correspondence to G. A. Galazutdinov, T. A. Santander, E. Babina or J. Krełowski.

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Galazutdinov, G.A., Santander, T.A., Babina, E. et al. The Interstellar Ti II Distance Scale. Astrophys. Bull. 78, 550–556 (2023). https://doi.org/10.1134/S1990341323700219

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