The Stellar Composition of the Star Formation Region CMa R1. II. Spectroscopic and Photometric Observations of 9 Young Stars

We present new high and low resolution spectroscopic and photometric data of nine members of the young association CMa R1. All the stars have circumstellar dust at some distance as could be expected from their association with reflection nebulosity. Four stars (HD 52721, HD 53367, LkHalpha 220 and LkHalpha 218) show Halpha emission and we argue that they are Herbig Be stars with discs. Our photometric and spectroscopic observations on these stars reveal new characteristics of their variability. We present first interpretations of the variability of HD 52721, HD 53367 and the two LkHalpha stars in terms of a partially eclipsing binary, a magnetic activity cycle and circumstellar dust variations, respectively. The remaining five stars show no clear indications of Halpha emission in their spectra, although their spectral types and ages are comparable with those of HD 52721 and HD 53367. This indicates that the presence of a disc around a star in CMa R1 may depend on the environment of the star. In particular we find that all Halpha emission stars are located at or outside the arc-shaped border of the H II region, which suggests that the stars inside the arc have lost their discs through evaporation by UV photons from nearby O stars, or from the nearby (< 25 pc) supernova, about 1 Myr ago.Comment: 17 pages, 13 figures, accepted by MNRA

Analysis of the circumstellar environment of the B[e] star HD 45677 (FS CMa)

We studied the circumstellar environment of the B[e] star HD 45677 through the analysis of the emission lines from ionized metals. We used the statistical approach of the self absorption curve method (SAC) to derive physical parameters of the line emitting region. The Fe II and Cr II double-peaked emission line structure is explained by the presence of a thin absorption component red shifted by ~3 km/s. This absorption component can be interpreted geometricaly as being due to infalling material perpendicularly to the disk seen nearly pole-on, as indicated by the emission line structure. The Cr II and Fe II emission lines have a complex structure with two (narrow and broad) components, of 45 and 180 km/s FWHM for the permitted lines and 25 and 100 km/s FWHM for the forbidden ones, respectively. We argue that the narrow components are principaly emitted by an optically thin disk seen nearly pole-on, in a region whose minimum radius is estimated to be 4 10^12 cm, while the broad ones are formed in a disk-linked wind.Comment: 14 pages, submitted to Astronomy and Astrophysic

Mobster: Accurate detection of mobile element insertions in next generation sequencing data

Mobile elements are major drivers in changing genomic architecture and can cause disease. The detection of mobile elements is hindered due to the low mappability of their highly repetitive sequences. We have developed an algorithm, called Mobster, to detect non-reference mobile element insertions in next generation sequencing data from both whole genome and whole exome studies. Mobster uses discordant read pairs and clipped reads in combination with consensus sequences of known active mobile elements. Mobster has a low false discovery rate and high recall rate for both L1 and Alu elements. Mobster is available at http://sourceforge.net/projects/mobster. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s13059-014-0488-x) contains supplementary material, which is available to authorized users

HUBUNGAN ANTARA E-SERVICE DENGAN KEPUTUSAN PEMBELIAN DI POSIE FLORIST SURAKARTA

ABSTRACTPosie Florist merupakan toko bunga yang berdiri sejak 2016 di Jebres, Kota Surakarta. Produk bunga potong di Posie florist berupa hand bouqet flower, flower vast, flower box dan dekorasi upacara pernikahan. Tujuan Penelitian ini adalah untuk menganalisis hubungan antara e-service dengan keputusan pembelian di Posie Florist Surakarta. Dalam penelitian ini  penulis menggunakan jenis penelitian deskriptif kuantitatif. Untuk pengambilan sampel konsumen, peneliti menggunakan convenience sampling. Responden yang digunakan dalam penelitian ini sebanyak 50 konsumen Posie Florist. Pengumpulan data diperoleh dengan wawancara, kuesioner, dan studi pustaka. Teknik analisis data yang digunakan adalah korelasi rank spearman. Hasil penelitian ini menyatakan bahwa e-service quality memiliki hubungan yang kuat dan positif terhadap keputusan pembelian produk bunga potong di Posie Florist. ABSTRACTPosie Florist is a flower shop that was established in 2016 at Jebres, Surakarta. Products sold at Posie Florist are hand bouqet flowers, flower vast, flower boxes, and wedding ceremony decorations. The purpose of this study was to analyze the relationship between e-service and purchasing decisions at Posie Florist Surakarta. In this research, the writer uses quantitative descriptive research type. consumer sampling, researchers used convenience sampling. Respondents taken in this study were as many as 50 Posie Florist’s consumers. Data collection was obtained by interview, questionnaire, and literature study. The data analysis technique used is the Spearman rank correlation. The results of this study stated that e-service quality has a strong and positive relationship with purchasing decisions for Posie Florist cut flowers.

ISO spectroscopy of disks around Herbig Ae/Be stars

We have investigated the infrared spectra of all 46 Herbig Ae/Be stars for which spectroscopic data is available in the ISO data archive. Our quantitative analysis of these spectra focusses on the emission bands linked to polycyclic aromatic hydrocarbons (PAHs), the amorphous 10 micron silicate band and the crystalline silicate band at 11.3 micron. We have detected PAH emission in 57% of the Herbig stars in our sample. Clear examples of differences in the PAH spectra are present within our sample, indicating differences in PAH size, chemistry and/or ionization. Amorphous silicate emission was detected in the spectra of 52% of the sample stars, amorphous silicate absorption in 13%. We have detected crystalline silicate emission in 11 stars (24% of our sample), of which four (9%) also display strong PAH emission. We have classified the sample sources according to the strength of their mid-IR energy distribution. The systems with stronger mid-infared (20-100 um) excesses relative to their near-infrared (1-5 um) excess display significantly more PAH emission than those with weaker mid-infrared excesses. This provides strong observational support for the disk models by Dullemond (2002), in which systems with a flaring disk geometry display a strong mid-infrared excess, whereas those with disks that are strongly shadowed by the puffed-up inner rim of the disk only display modest amounts of mid-infrared emission. The PAH emission is expected to be produced mainly in the part of the disk atmosphere that is directly exposed to radiation from the central star. In this model, self-shadowed disks should display weaker PAH emission than flared disks, consistent with our observations.Comment: 27 pages, 26 figures, A&A accepted (22/06/2004

A spectroscopic survey of Herbig Ae/Be stars with X-shooter – I. Stellar parameters and accretion rates

Herbig Ae/Be stars (HAeBes) span a key mass range that links low- and high-mass stars, and thus provide an ideal window from which to explore their formation. This paper presents Very Large Telescope/X-shooter spectra of 91 HAeBes, the largest spectroscopic study of HAeBe accretion to date. A homogeneous approach to determining stellar parameters is undertaken for the majority of the sample. Measurements of the ultraviolet are modelled within the context of magnetospheric accretion, allowing a direct determination of mass accretion rates. Multiple correlations are observed across the sample between accretion and stellar properties: the youngest and often most massive stars are the strongest accretors, and there is an almost 1:1 relationship between the accretion luminosity and stellar luminosity. Despite these overall trends of increased accretion rates in HAeBes when compared to classical T Tauri stars, we also find noticeable differences in correlations when considering the Herbig Ae and Herbig Be subsets. This, combined with the difficulty in applying a magnetospheric accretion model to some of the Herbig Be stars, could suggest that another form of accretion may be occurring within Herbig Be mass range

EXPORT: optical photometry and polarimetry of Vega-type and pre-main sequence stars

This paper presents optical UBVRI broadband photo-polarimetry of the EXPORT sample obtained at the 2.5m Nordic Optical Telescope. The database consists of multi-epoch photo-polarimetry of 68 pre-main-sequence and main-sequence stars. An investigation of the polarization variability indicates that 22 objects are variable at the 3sigma level in our data. All these objects are pre-main sequence stars, consisting of both T Tauri and Herbig Ae/Be objects while the main sequence, Vega type and post-T Tauri type objects are not variable. The polarization properties of the variable sources are mostly indicative of the UXOR-type behaviour; the objects show highest polarization when the brightness is at minimum. We add seven new objects to the class of UXOR variables (BH Cep, VX Cas, DK Tau, HK Ori, LkHa 234, KK Oph and RY Ori). The main reason for their discovery is the fact that our data-set is the largest in its kind, indicating that many more young UXOR-type pre-main sequence stars remain to be discovered. The set of Vega-like systems has been investigated for the presence of intrinsic polarization. As they lack variability, this was done using indirect methods, and apart from the known case of BD +31.643, the following stars were found to be strong candidates to exhibit polarization due to the presence of circumstellar disks: 51 Oph, BD +31.643C, HD 58647 and HD 233517.Comment: A&A accepte

Debridement with high speed burr reduce more colonies of Staphylococcus aureus in chronic osteomyelitis of rabbit’s tibia compare to debridement with curettage

Background: Chronic osteomyelitis has been a difficult problem for the patient and for the treating physician. Chronic osteomyelitis is defined by most authors as osteomyelitis with symptoms that have been present for more than 1 month. Chronic osteomyelitis also defined by an infected dead bone within compromise soft tissue. An aggressive debridement and specific antibiotic treatment is first choice for chronic osteomyelitis. The purpose of this study was to assess the reduction in the number of colonies of Staphylococcus aureus after debridement with a high speed burr compared to debridement with curettage.Methods: This study is an experimental study was designed using a randomized post-test only group design. A total of 42 rabbits inoculated his right tibia with 0.1 ml Staphylococcus aureus 107 CFU / ml, and then inserted with K-wire intramedullary. Two weeks after inoculation, chronic osteomyelitis occurs, grade 3 and 4 radiologically. Then 10 rabbits were sacrificed without debridement, colonies of germs counted as control, 16 rabbits was performed debridement with curettage and 16 rabbits was performed debridement with high speed burr. Three weeks after debridement, 32 rabbits was sacrificed and counted for final germs colonies.Results: The results obtained from debridement with high speed burr and debridement with curettage, number of colonies of Staphylococcus aureus is less than the number of control’s colonies, with a value of p = 0.006 (p <0.05), debridement with a high speed burr also decrease the number of colonies of Staphylococcus aureus compared to debridement with curettage, with p = 0.023 (p<0.05), odds ratio of 9.000 (CI=95%). This is shows that this difference is statistically significant.Conclusions: The data showed that debridement with a high speed burr more likely to decrease the number of colonies of germs that can be recommended as a method of debridement for chronic osteomyelitis

The Stellar Composition of the Star Formation Region CMa R1 -- III. A new outburst of the Be star component in Z CMa

We report on a recent event in which, after more than a decade of slowly fading, the visual brightness of the massive young binary Z CMa suddenly started to rise by about 1 magnitude in December 1999, followed by a rapid decline to its previous brightness over the next six months. This behaviour is similar to that exhibited by this system around its eruption in February 1987. A comparison of the intrinsic luminosities of the system with recent evolutionary calculations shows that Z CMa may consist of a 16 M_sun B0 IIIe primary star and a ~ 3 M_sun FUOr secondary with a common age of ~ 3 x 10^5 yr. We also compare new high-resolution spectra obtained in Jan. and Feb. 2000, during the recent rise in brightness, with archive data from 1991 and 1996. The spectra are rich in emission lines, which originate from the envelope of the early B-type primary star. The strength of these emission lines increased strongly with the brightness of Z CMa. We interpret the collected spectral data in terms of an accretion disc with atmosphere around the Herbig B0e component of Z CMa, which has expanded during the outbursts of 1987 and 2000. A high resolution profile of the 6300 A [O I] emission line, obtained by us in March 2002 shows an increase in flux and a prominent blue shoulder to the feature extending to ~ -700 km/s, which was much fainter in the pre-outburst spectra. We propose that this change in profile is a result of a strong change in the collimation of a jet, as a result of the outburst at the start of this century.Comment: 22 pages, 12 figures, accepted for publication in MNRA