A Gaia DR2 view of white dwarfs in the Hyades

Salaris, Maurizio; Bedin, L. R.

doi:10.1093/mnras/sty2096

Cited by 21 publications

(19 citation statements)

References 31 publications

(82 reference statements)

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“…Yet, the Hyades also contain a sufficient number of evolved stars. Again based on Gaia parallaxes, Salaris & Bedin (2018) find at least 8 white dwarfs as Hyades cluster members, which as the more massive stars have already passed the red giant stage.…”

Section: Evolutionary States: a Small But Crucial Differencementioning

confidence: 98%

Magnetic activity and evolution of the four Hyades K giants

Schröder

Mittag

Jack

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We determine the exact physical parameters of the four Hyades cluster K giants, using their parallaxes and atmospheric modeling of our red-channel TIGRE high-resolution spectra. Performing a comparison with well-tested evolutionary tracks, we derive exact masses and evolutionary stages. At an age of 588 (±60) Myrs and with a metallicity of Z=0.03 (consistent with the spectroscopic abundances), we find HD 27371 and HD 28307, the two less bright K giants, at the onset of central helium-burning, entering their blue loops with a mass of 2.62 M ⊙ , while the slightly brighter stars HD 28305 and HD 27697 are already exiting their blue loop. Their more advanced evolution suggests a higher mass of 2.75 M ⊙ .Notably, this pairing coincides with the different activity levels, which we find for these four stars from chromospheric activity monitoring with TIGRE and archival Mount Wilson data as well as from ROSAT coronal detections: The two less evolved K giants are the far more active pair, and we confidently confirm their rotation with periods of about 142 days. This work therefore provides some first, direct evidence of magnetic braking during the 130 Myrs lasting phase of central helium-burning, similar to what has long been known to occur to cool main-sequence stars.

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Section: Evolutionary States: a Small But Crucial Differencementioning

confidence: 98%

Magnetic activity and evolution of the four Hyades K giants

Schröder

Mittag

Jack

et al. 2019

Monthly Notices of the Royal Astronomical Society

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“…After the first submission of this paper, a new article by Salaris & Bedin (2018) makes use of the same sample of single DA WDs. Using a recent estimate of the cluster age from the main-sequence turn off, these authors derived the WD progenitor masses and compared the Hyades IFMR with the global IFMR.…”

Section: White Dwarfsmentioning

confidence: 99%

A 3D view of the Hyades stellar and sub-stellar population

Lodieu

Smart

Pérez‐Garrido

et al. 2019

A&A

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Aims. Our scientific goal is to provide a 3D map of the nearest open cluster to the Sun, the Hyades, combining the recent release of Gaia astrometric data, ground-based parallaxes of sub-stellar member candidates and photometric data from surveys which cover large areas of the cluster. Methods. We combined the second Gaia release with ground-based H-band parallaxes obtained with the infrared camera on the 2-m robotic Liverpool telescope to astrometrically identify stellar and sub-stellar members of the Hyades, the nearest open cluster to the Sun. Results. We find 1764 objects within 70 • radius from the cluster center from the Gaia second data release, whose kinematic properties are consistent with the Hyades. We limit our study to 30 pc from the cluster center (47.03±0.20 pc) where we identify 710 candidate members, including 85 and 385 in the core and tidal radius, respectively. We determine proper motions and parallaxes of eight candidate brown dwarf members and confirm their membership. Using the 3D positions and a model-based mass-luminosity relation we derive a luminosity and mass function in the 0.04 to 2.5 M range. We confirm evidence for mass segregation in the Hyades and find a dearth of brown dwarfs in the core of the cluster. From the white dwarf members we estimate an age of 640 +67 −49 Myr. Conclusions. We identify a list of members in the Hyades cluster from the most massive stars down to the brown dwarfs. We produce for the first time a 3D map of the Hyades cluster in the stellar and sub-stellar regimes and make available the list of candidate members.

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“…Since the advent of Gaia, the knowledge and census of Galactic OCs have also been substantially furthered (e.g., Gaia Collaboration et al 2017;Cantat-Gaudin et al 2018a,b). Furthermore, a large number of new WDs have been discovered and characterized (Gentile Fusillo et al 2019), including WDs in OCs (e.g., Salaris & Bedin 2018Richer et al 2019).…”

Section: Introductionmentioning

confidence: 99%

White dwarf-open cluster associations based on Gaia DR2

Prišegen

Piecka

Faltová

et al. 2020

A&A

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Context. Fundamental parameters and physical processes leading to the formation of white dwarfs (WDs) may be constrained and refined by discovering WDs in open clusters (OCs). Cluster membership can be utilized to establish the precise distances, luminosities, ages, and progenitor masses of such WDs. Aims. We compile a list of probable WDs that are OC members in order to facilitate WD studies that are impractical or difficult to conduct for Galactic field WDs. Methods. We use recent catalogs of WDs and OCs that are based on the second data release of the Gaia satellite mission (GDR2) to identify WDs that are OC members. This crossmatch is facilitated by the astrometric and photometric data contained in GDR2 and the derived catalogs. Assuming that most of the WD members are of the DA type, we estimate the WD masses, cooling ages, and progenitor masses. Results. We have detected several new likely WD members and reassessed the membership of the literature WDs that had been previously associated with the studied OCs. Several of the recovered WDs fall into the recently reported discontinuity in the initialfinal mass relation (IFMR) around M i ∼ 2.0M , which allows for tighter constrains on the IFMR in this regime.

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A Gaia DR2 view of white dwarfs in the Hyades

Cited by 21 publications

References 31 publications

Magnetic activity and evolution of the four Hyades K giants

Magnetic activity and evolution of the four Hyades K giants

A 3D view of the Hyades stellar and sub-stellar population

White dwarf-open cluster associations based on Gaia DR2

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