Magnitudes and Colors for Stars in Two New Galactic Clusters.

Stock, J.

doi:10.1086/146158

Cited by 14 publications

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“…Here we report the analysis of a large sample of stars that are on the MS and are giants in the nearby and poorly studied open cluster Stock 2. This is a dispersed cluster discovered by Stock (1956) and is located in the Orion spiral arm, [α(2000) = 2h15m, δ(2000) = +59 • 16 , = 133.334 • , b = −1.694 •1 ], roughly on the same line of sight as the double cluster h & χ Persei, but considerably closer to the Sun. However, despite its proximity, the physical parameters for this cluster such as age or chemical composition are not precisely known.…”

Section: Introductionmentioning

confidence: 93%

Stellar Population Astrophysics (SPA) with the TNG

Alonso-Santiago

Frasca

Catanzaro

et al. 2021

A&A

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Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself, we performed high-resolution spectroscopy in the framework of the Stellar Population Astrophysics project. We employed the High Accuracy Radial velocity Planet Searcher in the Northern hemisphere spectrograph at the Telescopio Nazionale Galileo (TNG). We completed our observations with additional spectra taken with the Catania Astrophysical Observatory Spectropolarimeter. We observed 46 stars (dwarfs and giants). They represent by far the largest sample collected for this cluster to date. We provide the stellar parameters, the extinction, and the radial and projected rotational velocities for most of the stars. Chemical abundances for 21 species with atomic numbers up to 56 have also been derived. We note a differential reddening in the cluster field with an average value of 0.27 mag. This appears the main cause for the observed eMSTO because it cannot be explained as the result of different rotational velocities, as found in other clusters. We estimate an age for Stock 2 of 450 ± 150 Ma, which corresponds to a MSTO stellar mass of ≈2.8 M⊙. The cluster mean radial velocity is about 8.0 km s−1. We find a solar-like metallicity for the cluster, [Fe/H] = −0.07 ± 0.06, compatible with its galactocentric distance. The chemical abundances of main-sequence stars and giants are compatible within the errors. The exceptions are barium and strontium, which are clearly overabundant in giants, and cobalt, which is only marginally overabundant. Finally, the chemical composition of Stock 2 is fully compatible with the composition observed in other open clusters of the Galactic thin-disc population.

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Section: Introductionmentioning

confidence: 93%

Stellar Population Astrophysics (SPA) with the TNG

Alonso-Santiago

Frasca

Catanzaro

et al. 2021

A&A

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show abstract

“…Here we report the analysis of a large sample of stars, both on the MS and giants in the nearby and poorly studied open cluster Stock 2. It is a dispersed cluster discovered by Stock (1956) •1 ], roughly in the same line of sight as the double cluster h & χ Persei, but considerably closer to the Sun. However, despite its proximity, physical parameters for this cluster such as age or chemical composition are not precisely known.…”

Section: Introductionmentioning

confidence: 95%

“…However, despite its proximity, physical parameters for this cluster such as age or chemical composition are not precisely known. According to the literature (Stock 1956;Krzeminski & Serkowski 1967;Robichon et al 1999;Spagna et al 2009) the distance to Stock 2 ranges between 300 and 350 pc, although the most recent studies, based on the second Gaia data release, place it at about 400 pc (Cantat-Gaudin et al 2018;Reddy & Lambert 2019). The average reddening is E(B−V) ≈ 0.35, but it seems to be variable across the cluster field (Krzeminski & Serkowski 1967;Spagna et al 2009;Ye et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Stellar Population Astrophysics (SPA) with the TNG: Stock 2, a little-studied open cluster with an eMSTO

Alonso-Santiago,

Frasca,

Catanzaro

et al. 2021

Preprint

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Stock 2 is a little-studied open cluster that shows an extended main-sequence turnoff (eMSTO). In order to investigate this phenomenon and characterise the cluster itself we performed high-resolution spectroscopy in the framework of the Stellar Population Astrophysics (SPA) project. We employed the High Accuracy Radial velocity Planet Searcher in North hemisphere spectrograph (HARPS-N) at the Telescopio Nazionale Galileo (TNG). We completed our observations with additional spectra taken with the Catania Astrophysical Observatory Spectrograph (CAOS). In total we observed 46 stars (dwarfs and giants), which represent, by far, the largest sample collected for this cluster to date. We provide the stellar parameters, extinction, radial and projected rotational velocities for most of the stars. Chemical abundances for 21 species with atomic numbers up to 56 have also been derived. We notice a differential reddening in the cluster field whose average value is 0.27 mag. It seems to be the main responsible for the observed eMSTO, since it cannot be explained as the result of different rotational velocities, as found in other clusters. We estimate an age for Stock 2 of 450±150 Ma which corresponds to a MSTO stellar mass of ≈2.8 M . The cluster mean radial velocity is around 8.0 km s −1 . We find a solar-like metallicity for the cluster, [Fe/H]=−0.07±0.06, compatible with its Galactocentric distance. MS stars and giants show chemical abundances compatible within the errors, with the exceptions of Barium and Strontium, which are clearly overabundant in giants, and Cobalt, which is only marginally overabundant. Finally, Stock 2 presents a chemical composition fully compatible with that observed in other open clusters of the Galactic thin disc.

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“…It was discovered by Stock (1956) from a study of photographic plates taken at the Warner and Swasey Observatory, who originally estimated the distance of the cluster to be ∼ 300 pc, corresponding to a distance modulus of m − M = 7.5. Results from UBV photoelectric photometry by Krzemiński & Serkowski (1967) agreed with this distance, and they found a mean reddening of E B−V = 0.375.…”

Section: Send Offprint Requests To: a Theissenmentioning

confidence: 99%

“…This region was subsequently broadened to allow for an uncertainty of 0.2 mag in the distance modulus (Stock 1956;Piskunov 1980), an uncertainty of 0.01 mag in the reddening (Krzemiński & Serkowski 1967), the photometric errors as listed in Table 2, and the effects of binarity. In the case of reddening, only the redder isochrone, i.e.…”

Section: Considering Only Ccd Photometrymentioning

confidence: 99%

CCD photometry and proper motions of late–type stars in the young open cluster Stock 2

Foster¹,

Theissen²,

Butler³

et al. 2000

Astron. Astrophys. Suppl. Ser.

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Abstract. We present the results of the first CCD BV RI photometric and proper motion study of late-type stars in the young open cluster Stock 2.Twenty-one fields of approximately 5 × 5 size have been observed photometrically, from which we have identified 118 candidate members based on their positions on colour-magnitude diagrams relative to theoretical isochrones. From a comparison of the known star density of the Pleiades, we estimate the contamination of this selection process due to background stars to be as large as ∼ 50%. However, only 22 of those 118 candidate members have proper motions consistent with membership, suggesting that the contamination is of the order of 80%.Additional candidate members were found by means of a proper motion analysis of Schmidt plate material for a 3• ×3• field containing the cluster. The cluster proper motion allows us to separate members from background and foreground stars. We have found 634 stars with a membership probability ≥ 50% down to a limiting magnitude of B ≈ 20, corresponding to late-M dwarfs at the distance of Stock 2 1 .

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Magnitudes and Colors for Stars in Two New Galactic Clusters.

Cited by 14 publications

References 0 publications

Stellar Population Astrophysics (SPA) with the TNG

Stellar Population Astrophysics (SPA) with the TNG

Stellar Population Astrophysics (SPA) with the TNG: Stock 2, a little-studied open cluster with an eMSTO

CCD photometry and proper motions of late–type stars in the young open cluster Stock 2

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