THE TYPE IA SUPERNOVA 1986G IN NGC 5128 : OPTICAL PHOTOMETRY AND SPECTRA.
THE TYPE IA SUPERNOVA 1986G IN NGC 5128 : OPTICAL PHOTOMETRY AND SPECTRA.
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DOI：
10.1086/132020
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发表时间：
1987-07
影响因子：
3.5
通讯作者：
M. Phillips;A. Phillips;S. Heathcote;V. Blanco;D. Geisler;D. Hamilton;N. Suntzeff;F. Jablonski;J. Steiner;A. Cowley;P. Schmidtke;S. Wyckoff;J. Hutchings;J. Tonry;M. Strauss;J. Thorstensen;W. Honey;J. Maza;M. Ruiz;A. Landolt;A. Uomoto;R. Rich;J. Grindlay;H. Cohn;H. Smith;J. Lutz;R. Lavery;A. Saha
中科院分区：
文献类型：
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作者：
M. Phillips;A. Phillips;S. Heathcote;V. Blanco;D. Geisler;D. Hamilton;N. Suntzeff;F. Jablonski;J. Steiner;A. Cowley;P. Schmidtke;S. Wyckoff;J. Hutchings;J. Tonry;M. Strauss;J. Thorstensen;W. Honey;J. Maza;M. Ruiz;A. Landolt;A. Uomoto;R. Rich;J. Grindlay;H. Cohn;H. Smith;J. Lutz;R. Lavery;A. Saha
展示了 NGC 5128（半人马座 A）中 Ia 型超新星 1986G 的光变曲线和光谱。尽管光谱演化与 Ia 型超新星的更常见的“较慢”光度类别非常相似，但在最大光谱中检测到了细微的差异。 SN 1986G光球层的膨胀速度在早期迅速下降。 SN 1986G 似乎被 NGC 5128 的尘埃带严重遮挡。这种情况解释了光谱中观察到的 Ca II H 和 K 和 Na I D 的强星际吸收线，以及作者识别出的弥漫星际带的特征。 SN 1986G 提供了 Ia 型超新星的光学光曲线和光谱特性存在内在差异的图形确认。因此，使用这些物体作为宇宙标准蜡烛时必须相当谨慎。作者得出了 DNGC 5128/DNGC 5055 = 0.39±0.04 的相对距离。
Optical light curves and spectra of the Type Ia supernova 1986G in NGC 5128 (Centaurus A) are presented. Although the spectral evolution closely resembled that of the more common "slower" photometric classes of Type Ia supernovae, subtle differences in the maximum-light spectra were detected. The expansion velocity of the photosphere of SN 1986G decreased rapidly at early phases. SN 1986G appears to have been heavily obscured by the dust lane of NGC 5128. This circumstances accounts for the strong interstellar-absorption lines of Ca II H and K and Na I D observed in the spectra as well as for features that the authors identify with the diffuse interstellar bands. SN 1986G provides graphic confirmation of the existence of intrinsic differences in the optical light curves and spectroscopic properties of Type Ia supernovae. Consequently, these objects must be used with considerable caution as cosmological standard candles. The authors derive a relative distance of DNGC 5128/DNGC 5055 = 0.39±0.04.