M67 Blue Stragglers with High-resolution Infrared Spectroscopy
arXiv:2309.16863 · doi:10.3847/1538-3881/acf2f3
Abstract
We report on the first detailed infrared chemical analysis of five binary members (S277, S997, S975, S1031, and S1195) in the open cluster M67 (NGC 2682). These stars are located outside (bluer and/or brighter than) the main-sequence turnoff region in M67. High-resolution (R ~ 45,000) near-infrared spectra were obtained with the Immersion GRating INfrared Spectrograph (IGRINS) at the McDonald Observatory 2.7 m Harlan J. Smith Telescope, providing full spectral coverage of the H and K bands. The abundances of C, Na, Mg, Al, Si, S, Ca, Fe, and Ni are measured using neutral atomic absorption lines. We detect v sin i greater than or equal to 25 km s-1 in three of our program stars: S1031, S975, and S1195. We find our derived abundances to be in good agreement with turnoff star abundances, similar to published analyses of blue straggler stars in M67 from optical spectra. Detection of a carbon enhancement or depletion resulting from mass transfer is difficult due to the uncertainties in the carbon abundance and the relatively modest changes that may occur through red giant and asymptotic giant branch evolution.
References in corpus (18)
- The NumPy array: a structure for efficient numerical computation
- A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
- A new implementation of the infrared flux method using the 2MASS catalogue
- Mergers and Obliquities in Stellar Triples
- Discovery of Carbon/Oxygen depleted Blue Straggler Stars in 47 Tucanae: the chemical signature of a mass-transfer formation process
- linemake: An Atomic and Molecular Line List Generator
- Chemical Abundances of Main-Sequence, Turnoff, Subgiant and red giant Stars from APOGEE spectra II: Atomic Diffusion in M67 Stars
- Metallicities for 13 nearby open clusters from high-resolution spectroscopy of dwarf and giant stars. Stellar metallicity, stellar mass, and giant planets
- The K2 M67 Study: Revisiting old friends with K2 reveals oscillating red giants in the open cluster M67
- 3D non-LTE line formation of neutral carbon in the Sun
- The end of the white dwarf cooling sequence in M 67
- The non-LTE line formation of neutral carbon in late-type stars
- UVIT Open Cluster Study. II. Detection of extremely low mass white dwarfs and post-mass transfer binaries in M67
- How much mass and angular momentum can the progenitors of carbon-enriched stars accrete?
- UOCS.VI. UVIT/AstroSat detection of low-mass white dwarf companions to 4 more blue stragglers in M67
- Investigating dynamical properties of evolved Galactic open clusters
- The K2 M67 Study: Precise Mass for a Turnoff Star in the Old Open Cluster M67
- A spectroscopic study of the blue stragglers in M67