<story><title>Betelgeuse Remains Steadfast in the Infrared</title><url>http://www.astronomerstelegram.org/?read=13518</url></story><parent_chain></parent_chain><comment><author>petschge</author><text>Have a look at the plot [1] from the excellent plotting tool [2] of the American Association of Variable star observers [3]. You see a strong dip in the U band (U for UV, 365 nm plus or minus 66 nm), B band (B for blue, 445 nm \pm 94 nm) and V band (V for visible, 551 nm \pm 88 nm). But in infrared (only the J band had enough data to make it worth plotting) at 1.22 micro (plus or minus 212 nm) the light curve is really flat.&lt;p&gt;1: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;imagebin.ca&amp;#x2F;v&amp;#x2F;5DhzHxxS3Eq2&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;imagebin.ca&amp;#x2F;v&amp;#x2F;5DhzHxxS3Eq2&lt;/a&gt;
2: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;www.aavso.org&amp;#x2F;LCGv2&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;www.aavso.org&amp;#x2F;LCGv2&amp;#x2F;&lt;/a&gt;
3: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;aavso.org&amp;#x2F;&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;aavso.org&amp;#x2F;&lt;/a&gt;</text></comment>
<story><title>Betelgeuse Remains Steadfast in the Infrared</title><url>http://www.astronomerstelegram.org/?read=13518</url></story><parent_chain></parent_chain><comment><author>Jun8</author><text>From the abstract:&lt;p&gt;&amp;quot;This suggests that the recent dramatic fading observed at visual wavelengths is due mostly to local surface phenomena, such as changes in dust extinction or molecular opacity along the line of sight through the inner wind and complex atmosphere, and&amp;#x2F;or surface temperature fluctuations.&amp;quot;</text></comment>