Star formation in IC1396: Kinematics and subcluster structure revealed by Gaia

Mara E. Pelayo-Baldárrago (Lead / Corresponding author), Aurora Sicilia-Aguilar, Min Fang, Veronica Roccatagliata, Jinyoung Serena Kim, David García-Álvarez

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)
41 Downloads (Pure)

Abstract

Aims. We investigate the star formation history of the IC1396 region by studying its kinematics and completing the population census.

Methods
. We use multiwavelength data, combining optical spectroscopy (to identify and classify new members), near-infrared photometry (to trace shocks, jets, and outflows and the interactions between the cluster members and the cloud), along with Gaia EDR3 to identify new potential members in the multidimensional proper motion/parallax space.

Results
. The revised Gaia EDR3 distance is 925±73 pc, slightly closer than previously obtained with DR2. The Gaia data reveal four distinct subclusters in the region. These subclusters are consistent in distance but display differences in proper motion. This, with their age differences, hints towards a complex and varied star formation history. Gaia data also unveil the intermediate-mass objects that tend to evade spectroscopic and disk surveys. Our analysis allows us to identify 334 new members. We estimate an average age of ∼4 Myr, confirming previous age estimates. With the new members added to our study, we estimate a disk fraction of 28%, lower than previous values, due to our method detecting mainly new, diskless intermediate-mass stars. We find age differences between the subclusters, which evidences a complex star formation history with different episodes of star formation.
Original languageEnglish
Article numberA22
Number of pages29
JournalAstronomy and Astrophysics
Volume669
Early online date22 Dec 2022
DOIs
Publication statusPublished - Jan 2023

Keywords

  • Globular clusters: individual: IC1396
  • H II regions
  • ISM: jets and outflows
  • Stars: formation
  • Stars: pre-main sequence
  • Techniques: spectroscopic

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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