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The main purpose of the dissertation is on the basis of long-term light curves, to be classified the variability of 28 PMS stars and to be draw conclusions about the physical mechanisms initiating observed changes in their brightness. 22 of the investigated stars are located in the dense molecular cloud L935, known as 'Gulf of Mexico' (NGC 7000/IC 5070), and 6 stars are located in the vicinity of the reflection nebula NGC 7129.
\n\nThe multicolour photometric observations that we present were performed from 1993 to 2015 with the 2-m RCC, the 50/70-cm Schmidt and the 60-cm Cassegrain telescopes of the Rozhen NAO (Bulgaria) and the 1.3-m RC telescope of the Skinakas Observatory (Greece). All frames were taken through a standard Johnson--Cousins set of filters.
\n\nThe studied stars were classified as follows:
\n\nPeriodicity was discovered for 3 of the investigated stars. V1716 Cyg indicates 4.15-day period, V1929 Cyg indicates 0.43-day period and LkH\u03b1 189 indicates 2.45-day period.
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R., 1972, ApJ, 172, 57" } ], "resource_type": { "id": "publication-thesis", "title": { "de": "Abschlussarbeit", "en": "Thesis" } }, "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": "T Tauri stars" }, { "subject": "Herbig Ae/Be stars" }, { "subject": "Young stellar objects" }, { "subject": "CCD photometry" }, { "subject": "Light curves" }, { "subject": "Stellar photometry" }, { "subject": "Two-color diagrams" }, { "subject": "Astronomical databases" }, { "subject": "Photometry" }, { "subject": "Emission line stars" }, { "subject": "Irregular variable stars" }, { "subject": "Pre-main sequence stars" }, { "subject": "Classical T Tauri stars" }, { "subject": "Weak-line T Tauri stars" }, { "subject": "Flare stars" } ], "title": "Activity of T Tauri type stars and objects similar to them" }, "parent": { "access": { "owned_by": { "user": 23508 } }, "communities": { "default": "b5023520-b14a-4f06-8085-b5af82c2e0da", "entries": [ { "access": { "member_policy": "open", "members_visibility": "public", "record_policy": "open", "review_policy": "open", "visibility": "public" }, "children": { "allow": false }, "created": "2015-04-01T20:29:36+00:00", "custom_fields": {}, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "b5023520-b14a-4f06-8085-b5af82c2e0da", "links": {}, "metadata": { "curation_policy": "This collection includes theses and dissertations written to complete Masters or PhD requirements on topics in the fields of astronomy and astrophysics. Other publication types and topics will not be accepted; however, documents that supplement your thesis, such as data sets or videos, are welcome. Although Zenodo accepts all file formats, PDF is strongly preferred for publication submissions. Theses and dissertations written in any language will be accepted, but the metadata record should be created in English. If the NASA ADS has already indexed your thesis, provide us the Bibcode in the Alternate Identifier field before submitting the document.
\r\n", "page": "This community, curated by astronomy librarians, aims to bring together astronomy and astrophysics theses and dissertations. Share the full-text of your cumulative, graduate or PhD level, research with the world by uploading it as open-access to this subject based community. Once added to the community, it can be indexed by ADS, searched for on Zenodo, and browsed to in the community page. The ADS indexes this community once a month.
\r\n\r\nThis thematic, community-wide repository – curated by astronomy librarians and indexed by the NASA ADS – collocates theses and dissertations on astronomy and astrophysics.
\r\n\r\nEven if the ADS already lists your dissertation, you can provide open access to a free, full-text, online version of your own work.
\r\n
\r\nBrowse the collection | Upload your thesis
For detailed instructions on contributing see: our short video walk-through or our written walk-through.
\r\n\r\nPoints to Remember!
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