Interstellar polarization and extinction towards the young open cluster NGC 1502

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00103432" target="_blank" >RIV/00216224:14310/18:00103432 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1051/0004-6361/201731903" target="_blank" >http://dx.doi.org/10.1051/0004-6361/201731903</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201731903" target="_blank" >10.1051/0004-6361/201731903</a>

Result language

angličtina

Original language name

Interstellar polarization and extinction towards the young open cluster NGC 1502

Original language description

Aims. NGC 1502 is located at the periphery of the Cam OB1 association and probably within the Orion Spur, with published distance estimates varying between 0.7 and 1.5 kpc. We combine new polarimetric observations and existing uvby beta and UBV photometries to provide new estimates of the cluster's parameters. Methods. We present new multi-wavelength polarization observations of 22 stars in the direction of the cluster and, using the wavelength of maximum polarization, calculate the total-to-selective extinction ratio for each of these stars. These are combined with homogenized uvby beta and UBV photometries to obtain the individual stellar distances and study the structure of the field. Results. We found no evidence of significant extinction variation across the cluster and obtained an average color excess E(b - y) = 0.56 +/- 0.02 mag, corresponding to E(B V) = 0.76 mag. Given the uniformity of both p(max) and lambda(max) toward the cluster and the distribution of the color excess with distance, it seems likely that the polarization in this region arises from aligned dust grains in the foreground of the cluster, not farther than 500-600 pc. Based on 20 stars located beyond 500 pc within the studied field of view, we obtained an average polarization-based total-to-selective extinction ratio R = 2.83 +/- 0.14 yielding visual absorption A(V) = 2.14 +/- 0.16 mag. Using 11 stars with uvby beta data that represent the main sequence of the cluster, we calculated a photometric distance of 1117(-89)(+96) pc. This estimate is fully supported by the UBV-based analysis and the new individual membership probabilities that we derive. Assuming a solar metallicity yields an age of 5 Myr. Our analysis yields controversial results regarding the membership of the stars associated with the SZ Cam system (HD 25638 and HD 25639) to the cluster.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/7AMB17AT030" target="_blank" >7AMB17AT030: The analysis of spotted stars using high precision data</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

ASTRONOMY &amp; ASTROPHYSICS

ISSN

1432-0746

e-ISSN

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Volume of the periodical

615

Issue of the periodical within the volume

8

Country of publishing house

FR - FRANCE

Number of pages

16

Pages from-to

166-181

UT code for WoS article

000440874200002

EID of the result in the Scopus database

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