Thesis Open Access

Activity of T Tauri type stars and objects similar to them

Ibryamov, Sunay


MARC21 XML Export

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    <subfield code="a">&lt;p&gt;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.&lt;/p&gt;

&lt;p&gt;The 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.&lt;/p&gt;

&lt;p&gt;The studied stars were classified as follows:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;V752 Cyg, V1539 Cyg, V1716 Cyg, FHO 26, FHO 29, LkHα 186, LkHα 187, LkHα 191, [KW97] 53-17, [KW97] 53-22, [KW97] 53-23, V391 Cep, NGC 7129 S V2 and 2MASS J21403576+6635000 show characteristics for classical T Tauri stars;&lt;/li&gt;
	&lt;li&gt;V1538 Cyg, V1929 Cyg, [KW97] 53-20 and NGC 7129 S V1 are probably weak-line T Tauri stars;&lt;/li&gt;
	&lt;li&gt;LkHα 189 and [KW97] 53-11 show characteristics for both type T Tauri stars and spectral observations are needed for their exact classification;&lt;/li&gt;
	&lt;li&gt;V350 Cep shows indications for EXor and/or FUor-type variability;&lt;/li&gt;
	&lt;li&gt;V521 Cyg, FHO 27, FHO 28 and NGC 7129 S V3 show characteristics for UXor-type variability;&lt;/li&gt;
	&lt;li&gt;V1957 Cyg, V2051 Cyg and [KW97] 53-36 likely are evolved PMS stars or post-T Tauri stars.&lt;/li&gt;
&lt;/ul&gt;

&lt;p&gt;Periodicity was discovered for 3 of the investigated stars. V1716 Cyg indicates 4.15-day period, V1929 Cyg indicates 0.43-day period and LkHα 189 indicates 2.45-day period.&lt;/p&gt;</subfield>
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