Found near the edges of HII regions, bright-rimmed clouds (BRCs) are thought to be home to triggered...
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Found near the edges of HII regions, bright-rimmed clouds (BRCs) are thought to be home to triggered star formation. Using Spitzer Space Telescope archival data, we investigated two BRCs, BRC 27 and BRC 34, to search for previously known and new candidate additional young stellar objects (YSOs). BRC 27 is located in the molecular cloud Canis Majoris R1, a known site of star formation. BRC 34 has a variety of features worthy of deeper examination: dark nebulae, molecular clouds, emission stars, and IR sources. Our team used rchival Spitzer InfraRed Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS), combined with 2-Micron All-Sky Survey (2MASS) data. We investigated the infrared properties of previously known YSOs and used infrared colors to identify additional new candidate YSOs in these regions.This research was made possible through the NASA/IPAC Teacher Archive Research Project (NITARP) and was funded by NASA Astrophysics Data Program and Archive Outreach funds

Spitzer-Selected Young Stellar Objectsin Two Bright-Rimmed CloudsChelen H Johnson1, Luisa M Rebull2, John Gibbs3, Marcella Linahan4, Diane Sartore5, Mark Legassie6, Russ Laher2,Nina Killingstad1, Taylor McCanna1, Alayna O’Bryan1, Melissa Clark1, Sarah Koop1, Stephanie Carlson1, Tiffany Ravelomanantsoa1,Thomas Nuthmann3, Tadavan Canakapalli3, Subret Aryal3, Megan Nishida3, Abhisek Ramswaram4, Heather Sprow4, Amanda Pullinger4, Nicolas Ezyk4, James Fagan4, Collen Tilley5, Kaelin Badura5 1Breck School (Minneapolis, MN), 2SSC/IPAC/Caltech (Pasadena, C)A, 3Glencoe High School (Hillsboro, OR), 4Carmel Catholic High School (Mundelein, IL) 5Pine Ridge High School (Deltona, FL), 6IPAC/Caltech/Raytheon (Pasadena, CA)


  • In each cloud, properties of previously known YSOs were examined and compared to known literature while also looking for new YSOs. This search exploited a well-known property of YSOs; large near- and mid-IR emissions from material surrounding young stars. All available data was gathered and reduced, and photometry was obtained.

  • Data sources included the following;

    • Spitzer archival data from the Infrared Array Camera (IRAC) and the Multiband Imaging Photometer for Spitzer (MIPS)

      • BRC 27 data originated from Spitzer program 30050 (AORKEYs 17512192 and 17512448)

      • BRC34 data originated from program 202 (AORKEYs 6031616 and 6031872)

    • Augmented data came from Two-Micron All-Sky Survey (2MASS) the Midcourse Space Experiment (MSX), and the Widefield Infrared Survey Explorer (WISE)

    • Original ground-based optical photometry in the Sloan bands was gathered using the 2-m Las Cumbres Observatory Global Telescope (LCOGT) on Haleakala

  • Using the combined data, we generated and analyze various plots, including spectral energy distributions (SEDs), color-magnitude diagrams, and color-color diagrams to search for stars with infrared excesses.

  • For photometry, we used a combination of MOPEX and the Aperture Photometry Tool (APT). We collected the photometry in MS Excel spreadsheets, which facilitated conversion between flux densities and magnitudes, generation of color-color and color-magnitude diagrams, and SEDs. This suite of techniques was essential in our identification and classification of young stellar objects.


Need more text … explain rediscover vs. new candidates

John’s awesome images of BRC 27 (above). BRC 34 (below) … with color key

Color-Color or Color-Magnitude diagrams for BRC 27.

Color-Color or Color-Magnitude diagrams for BRC 27.

Sample SEDs

We gratefully acknowledge funding via NASA Astrophysics Data Program funds and NASA/IPAC Archive Outreach funds.

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