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In young pre-main sequence clusters, observations typically reveal a large luminosity spread between cluster members, which may be the result of observational errors or evolutionary processes. In this work, we attempt to constrain observational uncertainties through improved membership, extinction, empirical colors, and independent Teff information. The recent success of magnetic and spotted models in explaining stellar parameter discrepancies for eclipsing binaries and pre-main sequence stars motivates a comparison with classical models in a young cluster. We apply our open cluster-calibrated, spectral energy distribution fitting technique to pre-MS stars on a sample of selected literature and APOGEE Net Teff's. We develop a Gaussian Mixture Model for determining cluster membership with Gaia DR2 data, and apply a highly selective cut in parallax and proper motion space. After obtaining stellar luminosity and temperature for our members, we provide isochronal ages with classical stellar models as well as spotted and magnetic models. Our luminosities imply a significant luminosity spread even with star-by-star extinction. We suggest that the ages of Class II stars in our cluster appear systematically younger than the Class III stars after accounting for star-by-star extinction. We find an age of Lambda Orionis of 3.9±0.2 Myr; with empirical intrinsic colors, classical models may underestimate stellar ages by as much as 50% at these early ages, if accounting for low mass stars. With multiple families of isochrones, we suggest that the inconsistency in isochrone ages between stars of high and low mass with classical models may be improved through the introduction of spots or magnetic effects in stellar evolution.
", "languages": [ { "id": "eng", "title": { "en": "English" } } ], "publication_date": "2021-02-26", "publisher": "Zenodo", "resource_type": { "id": "poster", "title": { "de": "Poster", "en": "Poster" } }, "rights": [ { "description": { "en": "The Creative Commons Attribution license allows re-distribution and re-use of a licensed work on the condition that the creator is appropriately credited." }, "icon": "cc-by-icon", "id": "cc-by-4.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/licenses/by/4.0/legalcode" }, "title": { "en": "Creative Commons Attribution 4.0 International" } } ], "subjects": [ { "subject": "Young stars" }, { "subject": "Stellar systems, clusters, and associations" }, { "subject": "Stellar parameters" } ], "title": "Age Spreads and Systematics in \u03bb Orionis with Gaia DR2 and the SPOTS tracks" }, "parent": { "access": { "owned_by": { "user": 200055 } }, "communities": { "default": "3a36ebe6-61f3-417e-a308-74ef84ccb263", "entries": [ { "access": { "member_policy": "open", "members_visibility": "public", "record_policy": "open", "review_policy": "open", "visibility": "public" }, "children": { "allow": false }, "created": "2021-01-13T17:28:36.286355+00:00", "custom_fields": {}, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "3a36ebe6-61f3-417e-a308-74ef84ccb263", "links": {}, "metadata": { "curation_policy": "Contributions are accepted from participants that presented invited plenary session reviews, contributed plenary session talks, short "Haiku" talks and contributed posters. In addition, individual and collective contributions from (parallel) Topical Interest Rooms are welcome. If you would like to submit a typical conference proceeding, there are no formal page limits. For guidance we recommend you limit yourself to 4-8 pages for contributed talks and 10-15 pages for invited talks. Those wishing to submit a written conference proceeding are encouraged to format the document using the CS20 LaTeX template (available on https://github.com/CoolStars20/proceedings/releases/latest). All such submissions should be made as PDFs and will be reviewed for content by the SOC and we may suggest edits.
\r\n\r\nSubmission of presentation slides from speakers and full posters are also encouraged. PDF versions of these documents are the preferred format for Zenodo contributions to permit the documents to be previewed in a web browser. For maximum impact, a written contribution may be provided with presentation slides and/or a poster to provide greater context. Contributions will be checked for the proper metadata. Instructions about how to prepare your contribution are available on http://coolstars20.cfa.harvard.edu/contributions.html
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