Possible evidence of asymmetry in SN 2007rt, a type IIn supernova

An optical photometric and spectroscopic analysis of the slowly-evolving type IIn SN 2007rt is presented, covering a duration of 481 days after discovery. Its earliest spectrum, taken approximately 100 days after the explosion epoch, indicates the presence of a dense circumstellar medium, with which the supernova ejecta is interacting. This is supported by the slowly-evolving light curve. A notable feature in the spectrum of SN 2007rt is the presence of a broad He I 5875 line, not usually detected in type IIn supernovae. This may imply that the progenitor star has a high He/H ratio, having shed a significant portion of its hydrogen shell via mass-loss. An intermediate resolution spectrum reveals a narrow H(alpha) P-Cygni profile, the absorption component of which has a width of 128 km s (1). This slow velocity suggests that the progenitor of SN 2007rt recently underwent mass-loss with wind speeds comparable to the lower limits of those detected in luminous blue variables. Asymmetries in the line profiles of H and He at early phases bears some resemblance to double-peaked features observed in a number of Ib/c spectra. These asymmetries may be indicative of an asymmetric or bipolar outflow or alternatively dust formation in the fast expanding ejecta. In addition, the late time spectrum, at over 240 days post-explosion, shows clear evidence for the presence of newly formed dust.

SN 2011A: A low-luminosity interacting transient with a double plateau and strong sodium absorpton

We present optical photometry and spectroscopy of the optical transient SN 2011A. Our data span 140 days after discovery including BVRI u′g′r′i′z′ photometry and 11 epochs of optical spectroscopy. Originally classified as a type IIn supernova (SN IIn) due to the presence of narrow Hα emission, this object shows exceptional characteristics. First, the light curve shows a double plateau, a property only observed before in the impostor SN 1997bs. Second, SN 2011A has a very low luminosity (M_V=-15.72), placing it between normal luminous SNe IIn and SN impostors. Third, SN 2011A shows low velocity and high equivalent width absorption close to the sodium doublet, which increases with time and is most likely of circumstellar origin. This evolution is also accompanied by a change in line profile; when the absorption becomes stronger, a P Cygni profile appears. We discuss SN 2011A in the context of interacting SNe IIn and SN impostors, which appears to confirm the uniqueness of this transient. While we favor an impostor origin for SN 2011A, we highlight the difficulty in differentiating between terminal and non-terminal interacting transients.

Supernova 2013fc in a circumnuclear ring of a luminous infrared galaxy: The big brother of SN 1998S

We present photometric and spectroscopic observations of SN 2013fc, a bright type II supernova (SN) in a circumnuclear star-forming ring in the luminous infrared galaxy ESO 154-G010, observed as part of the Public ESO Spectroscopic Survey of Transient Objects. SN 2013fc is both photometrically and spectroscopically similar to the well-studied type IIn SN 1998S and to the bright type II-L SN 1979C. It exhibits an initial linear decline, followed by a short plateau phase and a tail phase with a decline too fast for ⁵⁶Co decay with full γ -ray trapping. Initially, the spectrum was blue and featureless. Later on, a strong broad (~8000 km s^-1) H α emission profile became prominent. We apply a STARLIGHT stellar population model fit to the SN location (observed when the SN had faded) to estimate a high extinction of A_V = 2.9 ± 0.2 mag and an age of 10⁺³ _-2 Myr for the underlying cluster.We compare the SN to SNe 1998S and 1979C and discuss its possible progenitor star considering the similarities to these events. With a peak brightness of B = -20.46 ± 0.21 mag, SN 2013fc is 0.9 mag brighter than SN 1998S and of comparable brightness to SN 1979C.We suggest that SN 2013fc was consistent with a massive red supergiant (RSG) progenitor. Recent mass loss probably due to a strong RSG wind created the circumstellar matter illuminated through its interaction with the SN ejecta. We also observe a near-infrared excess, possibly due to newly condensed dust.

BONA FIDE, STRONG-VARIABLE GALACTIC LUMINOUS BLUE VARIABLE STARS ARE FAST ROTATORS: DETECTION OF A HIGH ROTATIONAL VELOCITY IN HR CARINAE

We report optical observations of the luminous blue variable (LBV) HR Carinae which show that the star has reached a visual minimum phase in 2009. More importantly, we detected absorptions due to Si lambda lambda 4088-4116. To match their observed line profiles from 2009 May, a high rotational velocity of nu(rot) similar or equal to 150 +/- 20 km s(-1) is needed (assuming an inclination angle of 30 degrees), implying that HR Car rotates at similar or equal to 0.88 +/- 0.2 of its critical velocity for breakup (nu(crit)). Our results suggest that fast rotation is typical in all strong-variable, bona fide galactic LBVs, which present S-Dor-type variability. Strong-variable LBVs are located in a well-defined region of the HR diagram during visual minimum (the ""LBV minimum instability strip""). We suggest this region corresponds to where nu(crit) is reached. To the left of this strip, a forbidden zone with nu(rot)/nu(crit) > 1 is present, explaining why no LBVs are detected in this zone. Since dormant/ex LBVs like P Cygni and HD 168625 have low nu(rot), we propose that LBVs can be separated into two groups: fast-rotating, strong-variable stars showing S-Dor cycles (such as AG Car and HR Car) and slow-rotating stars with much less variability (such as P Cygni and HD 168625). We speculate that supernova (SN) progenitors which had S-Dor cycles before exploding (such as in SN 2001ig, SN 2003bg, and SN 2005gj) could have been fast rotators. We suggest that the potential difficulty of fast-rotating Galactic LBVs to lose angular momentum is additional evidence that such stars could explode during the LBV phase.

Symmetry coefficients and incompressibility of clusterized supernova matter

The symmetry energy coefficients, incompressibility, and single-particle and isovector potentials of clusterized dilute nuclear matter are calculated at different temperatures employing the S-matrix approach to the evaluation of the equation of state. Calculations have been extended to understand the aforesaid properties of homogeneous and clusterized supernova matter in the subnuclear density region. A comparison of the results in the S-matrix and mean-field approach reveals some subtle differences in the density and temperature region we explore.

Sobre la supernova del 1006

En el artículo de J. M. Vaquero, M. C. Gallego y J. M. Cobos se corrige la identificación del que aparece citado en la noticia núm. 7 de mi artículo <>. Como se precisa, tal vez de forma excesivamente escueta, en la nota 25 de este último, el problema se deriva de que el fragmento que tradujo Huici (y que es también el de la edición marroquí) no contiene uno, sino dos meteorológicos.

Venäjän suhde ETYJ:iin

Tässä diplomityössä tarkastellaan Venäjän suhdetta ETYJ:iin. Tarkoituksena on tarkastella sitä, miten Venäjä rakentaa ja muotoilee oman näkemyksensä ETYJ:in toimintaan ja esittää näkemyksensä muille. Venäjä rakentaa todellisuutta ja valtasuhdetta omilla intressialueillaan käyttämällä viestintää välineenä. Venäjän ja länsimaiden ETYJ:in puitteissa käyttämien puheenvuorojen voidaan ajatella olevan diskurssikamppailua siitä, miten arvoyhteisön normeja voidaan soveltaa ja mikä on hyväksyttävää toimintaa. Tutkimuksen tavoitteena on pyrkiä selvittämään Venäjän suhdetta ETYJ:iin tutkimalla Venäjän ulkopoliittista diskurssia ETYJ:in toiminnasta Itä-Euroopassa ja Georgian tilanteeseen liittyen, sekä presidentti Medvedevin aloitteessa uudesta eurooppalaisesta turvallisuusjärjestelystä. Yleisenä teoreettisena lähtökohtana suhteiden tarkasteluun käytetään konstruktivismia. Metodina on käytetty kriittistä diskurssianalyysia. Pääasiallisena lähteenä on käytetty Venäjän lausuntoja ETYJ:issä vuosilta 2006–2010. Venäjän näkökulmasta kiistanalaisten asioiden luonne liit-tyy suoraan tai läheisesti materiaalisiin tai muuten konkreettisesti ilmeneviin intresseihin. Venäläisen lähestymistavan mukaan asioista neuvotellaan niin, että vastakkainasettelun omaisesta lähtökohdasta tingitään ja tehdään kompromisseja, sekä sitoudutaan vastavuoroisesti. Länsimaisesta näkökulmasta kiistanalaisuus liittyy arvoihin tai normeihin, joiden kautta pyritään löytämään vuorovaikutteisesti muuntumiseen pohjautuvia ratkaisuja. Venäjän kielenkäytöstä ei ole löydettävissä suoranaista piilotettua agendaa, mutta vivahde piilovaikuttamisesta tulee vastaan Itä-Euroopan maita koskevissa lausunnoissa. Vaikutelma on sellainen, että vaikuttamisen kohde on venäläinen yleisö. Teemana on silloin kansallisen identiteetin ja maailmanpolitiikan vaikuttajan roolin rakentaminen. Venäjän suhde ETYJ:iin tulee varmasti pysymään kompleksisena, mutta sen pyrkimys läsnäoloon päätöksenteossa pakottanee sen jatkossakin tekemään kompromisseja omien intressiensä suhteen.

Yleispiirteinen kartta Iin pitäjästä

Kartan esitystekniikka: maastokartta.

Nijden terwellisten sanain muoto, 2 Tim. 1:13. Sijnä järjestyxesä kuin d. Lutheruxen Catechismus sen päkappaleisa sisällänspitä, nijden enimmäin catechismuxen selittäitten johdatuxen jälkeen, edeswetänyt ja kokoonpannut yxinkertaisisa kysymyxisä ja wastauxisa. Wuonna 1782. Eric Frosterus v. past. ja cappalainen Haukiputan kappelilla, Iin pitäjäsä

Arkit: A-M8 N6