论文标题
NGC 247 Galaxy中的新的发光蓝色可变候选者
New luminous blue variable candidates in the NGC 247 galaxy
论文作者
论文摘要
我们在本地组以外的星系中搜索LBV星星。在这里，我们介绍了NGC 247 Galaxy中两个明亮的$Hα$来源的研究。 Object j004703.27-204708.4 ($M_V=-9.08 \pm 0.15^m$) shows the spectral lines typical for well-studied LBV stars: broad and bright emission lines of hydrogen and helium He I with P Cyg profiles, emission lines of iron Fe II, silicon Si II, nitrogen N II and carbon C II, forbidden iron [Fe II] and nitrogen [N ii]线。对象的可变性为$ΔB= 0.74 \ pm0.09^m $和$ΔV= 0.88 \ pm0.09^m $，这使其可靠LBV候选者。 Star J004702.18-204739.93（$ M_V = -9.66 \ pm 0.23^m $）显示了铁Fe II的许多发射线，禁止铁线[Fe II]，带有宽翅膀的明亮氢线，以及在Cluteallar Matter中形成的氧气和氧气[O I]和氧气[O I]和concium [o i]的禁止线。该恒星光曲线的研究也没有显示出亮度的显着变化（$ΔV= 0.29 \ pM0.09^m $）。我们获得了星际吸收，光球温度的估计值以及降高$ m_ \ text {bol} = -10.5^{+0.5} _ { - 0.4} $和$ m_ \ $ m_ \ text {bol} = -10.8^10.8^10.8^{+0.5^{+0.5^{+0.5} $\log(L_\text{bol}/L_{\odot})=6.11^{+0.20}_{-0.16}$ and $6.24^{+0.20}_{-0.25}$ for j004703.27-204708.4 and j004702.18-204739.93 respectively.因此，对象J004703.27-204708.4仍然是可靠的LBV候选者，而对象J004702.18-204739.93可以归类为b [e] -supergiant。
We search for LBV stars in galaxies outside the Local Group. Here we present a study of two bright $Hα$ sources in the NGC 247 galaxy. Object j004703.27-204708.4 ($M_V=-9.08 \pm 0.15^m$) shows the spectral lines typical for well-studied LBV stars: broad and bright emission lines of hydrogen and helium He I with P Cyg profiles, emission lines of iron Fe II, silicon Si II, nitrogen N II and carbon C II, forbidden iron [Fe II] and nitrogen [N II] lines. The variability of the object is $ΔB = 0.74\pm0.09^m$ and $ΔV = 0.88\pm0.09^m$, which makes it reliable LBV candidate. The star j004702.18-204739.93 ($M_V=-9.66 \pm 0.23^m$) shows many emission lines of iron Fe II, forbidden iron lines [Fe II], bright hydrogen lines with broad wings, and also forbidden lines of oxygen [O I] and calcium [Ca II] formed in the circumstellar matter. The study of the light curve of this star also did not reveal significant variations in brightness ($ΔV = 0.29\pm0.09^m$). We obtained estimates of interstellar absorption, the photosphere temperature, as well as bolometric magnitudes $M_\text{bol}=-10.5^{+0.5}_{-0.4}$ and $M_\text{bol}=-10.8^{+0.5}_{-0.6}$, which corresponds to bolometric luminosities $\log(L_\text{bol}/L_{\odot})=6.11^{+0.20}_{-0.16}$ and $6.24^{+0.20}_{-0.25}$ for j004703.27-204708.4 and j004702.18-204739.93 respectively. Thus, the object j004703.27-204708.4 remains a reliable LBV candidate, while the object j004702.18-204739.93 can be classified as B[e]-supergiant.
