The young star population of Lynds 1188

Szegedi-Elek, Elza and Kun, Mária and Moór, Attila and Marton, Gábor and Reipurth, B. (2019) The young star population of Lynds 1188. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 484 (2). pp. 1800-1814. ISSN 0035-8711

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Abstract

We present new results on the young star population of the Lynds 1188 molecular cloud, which is associated with the Cepheus Bubble, a giant interstellar shell around the association Cep OB 2. In order to reveal the star-forming scenario of the molecular cloud located on the supershell, and to understand the history of star formation in the region, we identified and characterized young star candidates based on an Hα emission survey and various published photometric data sets. Using Gaia Data Release 2 astrometry, we studied the spatial distribution of the young star candidates and we isolated three groups based on their distances. We constructed spectral energy distributions of our target stars, based on photometric data from the Panoramic Survey Telescope and Rapid Response System (Pan-STARRS), the Two-Micron All-Sky Survey (2MASS), the Spitzer Space Telescope and the Wide-field Infrared Survey Explorer (WISE), estimating their spectral types, extinctions and luminosities. We estimated masses by means of pre-main-sequence evolutionary models, and we derived accretion rates from the equivalent width of the Hα line. We studied the structure of the cloud by constructing a new extinction map, based on Pan-STARRS data. Our results show that the distribution of low-mass young stars in L1188 is well correlated with that of the dust and molecular gas. We identified two small, compact clusters and a loose aggregate of young stars. We found that star formation in L1188 started about 5 Myr ago. The apparent age gradient of young stars across the cloud and the ammonia cores located to the east of the optically visible young stellar groups support the scenario of star formation propagating away from the centre of the Cepheus Bubble.

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